simplified code across the app and consolidated duplicated helpers

lib/api/errors/error_mapper.dart

@@ -10,9 +10,7 @@ import '../api_error.dart';
 import '../http_errors.dart';
 import '../marianumcloud/talk/talk_error.dart';
 import 'app_exception.dart';
-import 'auth_exception.dart';
 import 'network_exception.dart';
-import 'not_found_exception.dart';
 import 'parse_exception.dart';
 import 'server_exception.dart';
 import 'talk_exception.dart';
@@ -65,23 +63,15 @@ AppException _dynamiteToAppException(DynamiteApiException error) {
   final detail = preview.isEmpty
       ? 'HTTP $status'
       : 'HTTP $status body=$preview';
-  switch (status) {
+  if (status == 429) {
-    case 401:
-      return AuthException.unauthorized(technicalDetails: detail);
-    case 403:
-      return AuthException.forbidden(technicalDetails: detail);
-    case 404:
-      return NotFoundException(technicalDetails: detail);
-    case 429:
     return ServerException(
       statusCode: status,
       userMessage:
           'Zu viele Anfragen. Bitte warte einen Moment, bevor du es erneut versuchst.',
       technicalDetails: detail,
     );
-    default:
-      return ServerException(statusCode: status, technicalDetails: detail);
   }
+  return exceptionForStatus(status, detail);
 }
 
 String errorToUserMessage(Object? error, {String fallback = _defaultFallback}) {

lib/api/http_errors.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 
 import 'package:http/http.dart' as http;
 
+import 'errors/app_exception.dart';
 import 'errors/auth_exception.dart';
 import 'errors/network_exception.dart';
 import 'errors/not_found_exception.dart';
@@ -42,12 +43,23 @@ String httpErrorDetail(String label, String body, int status) {
       : '$label -> HTTP $status body=$preview';
 }
 
-/// Throws the [AppException] matching a non-2xx HTTP [status], carrying
+/// The [AppException] matching a non-2xx HTTP [status], carrying [detail] as
-/// [detail] as technical details: 401/403 map to auth errors, 404 to
+/// technical details: 401/403 map to auth errors, 404 to not-found, everything
-/// not-found, everything else to a generic server error.
+/// else to a generic server error.
-Never throwForStatus(int status, String detail) {
+AppException exceptionForStatus(int status, String detail) => switch (status) {
-  if (status == 401) throw AuthException.unauthorized(technicalDetails: detail);
+  401 => AuthException.unauthorized(technicalDetails: detail),
-  if (status == 403) throw AuthException.forbidden(technicalDetails: detail);
+  403 => AuthException.forbidden(technicalDetails: detail),
-  if (status == 404) throw NotFoundException(technicalDetails: detail);
+  404 => NotFoundException(technicalDetails: detail),
-  throw ServerException(statusCode: status, technicalDetails: detail);
+  _ => ServerException(statusCode: status, technicalDetails: detail),
+};
+
+/// Throws [exceptionForStatus].
+Never throwForStatus(int status, String detail) =>
+    throw exceptionForStatus(status, detail);
+
+/// Throws [exceptionForStatus] unless [response] is 2xx.
+void ensureSuccess(String label, http.Response response) {
+  final status = response.statusCode;
+  if (status >= 200 && status < 300) return;
+  throwForStatus(status, httpErrorDetail(label, response.body, status));
 }

lib/api/marianumcloud/app_password/delete_app_password.dart

@@ -18,13 +18,7 @@ class DeleteAppPassword {
       NextcloudOcs.uri('core/apppassword'),
       // An explicit header may belong to an inactive account, so the active
       // session's headers must not be required then.
-      headers: authorizationHeader == null
+      headers: NextcloudOcs.headers(authorization: authorizationHeader),
-          ? NextcloudOcs.headers()
-          : {
-              'Accept': 'application/json',
-              'OCS-APIRequest': 'true',
-              'Authorization': authorizationHeader,
-            },
     );
   }
 }

lib/api/marianumcloud/app_password/get_app_password.dart

@@ -28,23 +28,17 @@ class GetAppPassword {
       label,
       () => _client.get(
         NextcloudOcs.uri('core/getapppassword'),
-        headers: {
-          ...NextcloudOcs.headers(),
         // Deliberately NOT the shared Authorization value: that one prefers
         // the app password, but an app password cannot mint another one —
         // this endpoint requires the real password.
-          'Authorization': SessionManager()
+        headers: NextcloudOcs.headers(
+          authorization: SessionManager()
               .requireNextcloud()
               .realPasswordBasicAuthHeader,
-        },
+        ),
       ),
     ))!;
-    if (response.statusCode < 200 || response.statusCode >= 300) {
+    ensureSuccess(label, response);
-      throwForStatus(
-        response.statusCode,
-        httpErrorDetail(label, response.body, response.statusCode),
-      );
-    }
     final json = jsonDecode(utf8.decode(response.bodyBytes));
     final data = (json as Map)['ocs']?['data'];
     final appPassword = data is Map ? data['apppassword'] as String? : null;

lib/api/marianumcloud/cloud_users/cloud_users_actions.dart

@@ -1,4 +1,3 @@
-import 'dart:convert';
 import 'dart:developer';
 import 'dart:typed_data';
 
@@ -96,9 +95,8 @@ class GetUserInfo {
       uri,
     );
     try {
-      final root = jsonDecode(response.body) as Map<String, dynamic>;
       final data =
-          (root['ocs'] as Map<String, dynamic>)['data'] as Map<String, dynamic>;
+          NextcloudOcs.decode(response.body)['data'] as Map<String, dynamic>;
       return CloudUserInfo(
         userId: data['id'] as String,
         displayName: (data['displayname'] as String?) ?? '',

lib/api/marianumcloud/login_flow/login_flow_api.dart

@@ -29,12 +29,7 @@ class LoginFlowApi {
         headers: {'Accept': 'application/json', 'User-Agent': userAgent},
       ),
     ))!;
-    if (response.statusCode < 200 || response.statusCode >= 300) {
+    ensureSuccess(label, response);
-      throwForStatus(
-        response.statusCode,
-        httpErrorDetail(label, response.body, response.statusCode),
-      );
-    }
     return LoginFlowInit.fromJson(
       jsonDecode(utf8.decode(response.bodyBytes)) as Map<String, dynamic>,
     );
@@ -53,12 +48,7 @@ class LoginFlowApi {
       ),
     ))!;
     if (response.statusCode == 404) return null;
-    if (response.statusCode < 200 || response.statusCode >= 300) {
+    ensureSuccess(label, response);
-      throwForStatus(
-        response.statusCode,
-        httpErrorDetail(label, response.body, response.statusCode),
-      );
-    }
     return LoginFlowCredentials.fromJson(
       jsonDecode(utf8.decode(response.bodyBytes)) as Map<String, dynamic>,
     );

lib/api/marianumcloud/nextcloud_ocs.dart

@@ -13,10 +13,13 @@ class NextcloudOcs {
   static Map<String, dynamic> decode(String raw) =>
       (jsonDecode(raw) as Map<String, dynamic>)['ocs'] as Map<String, dynamic>;
 
-  static Map<String, String> headers() => {
+  /// [authorization] overrides the active session's credentials, which are
+  /// then not required.
+  static Map<String, String> headers({String? authorization}) => {
     'Accept': 'application/json',
     'OCS-APIRequest': 'true',
-    'Authorization': SessionManager().requireNextcloud().basicAuthHeader,
+    'Authorization':
+        authorization ?? SessionManager().requireNextcloud().basicAuthHeader,
   };
 
   static Uri uri(String pathSuffix, {Map<String, dynamic>? queryParameters}) {

lib/api/marianumcloud/talk/chat/fetch_chat_page.dart

@@ -0,0 +1,46 @@
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+
+import '../../../errors/server_exception.dart';
+import '../../../http_errors.dart';
+import '../../nextcloud_ocs.dart';
+import 'get_chat_params.dart';
+import 'get_chat_response.dart';
+
+/// GETs a chat page outside [TalkApi], which treats non-2xx as errors: here
+/// HTTP 304 (nothing new / no older messages) is a normal outcome and yields
+/// `null`.
+Future<GetChatResponse?> fetchChatPage({
+  required String label,
+  required String chatToken,
+  required GetChatParams params,
+  Duration? timeout,
+  bool parseOffIsolate = false,
+}) async {
+  final uri = NextcloudOcs.uri(
+    'apps/spreed/api/v1/chat/$chatToken',
+    queryParameters: params.toJson(),
+  );
+  final headers = NextcloudOcs.headers();
+
+  final response = (await sendGuarded('$label $uri', () {
+    final request = http.get(uri, headers: headers);
+    return timeout == null ? request : request.timeout(timeout);
+  }))!;
+
+  final status = response.statusCode;
+  if (status == 304) return null;
+  if (status >= 200 && status < 300) {
+    final parsed = parseOffIsolate
+        ? await compute(_parseChatResponse, response.body)
+        : _parseChatResponse(response.body);
+    return parsed..headers = response.headers;
+  }
+  throw ServerException(
+    statusCode: status,
+    technicalDetails: '$label $uri: HTTP $status',
+  );
+}
+
+GetChatResponse _parseChatResponse(String body) =>
+    GetChatResponse.fromJson(NextcloudOcs.decode(body));

lib/api/marianumcloud/talk/chat/get_chat.dart

@@ -1,6 +1,3 @@
-import 'package:http/http.dart' as http;
-import 'package:http/http.dart';
-
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_chat_params.dart';
@@ -16,11 +13,4 @@ class GetChat extends TalkApi<GetChatResponse> {
   @override
   GetChatResponse assemble(String raw) =>
       GetChatResponse.fromJson(NextcloudOcs.decode(raw));
-
-  @override
-  Future<Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/chat/get_chat_history.dart

@@ -1,17 +1,12 @@
-import 'package:flutter/foundation.dart';
+import 'fetch_chat_page.dart';
-import 'package:http/http.dart' as http;
-
-import '../../../errors/server_exception.dart';
-import '../../../http_errors.dart';
-import '../../nextcloud_ocs.dart';
 import 'get_chat_params.dart';
 import 'get_chat_response.dart';
 
 /// Backwards-paging variant of GetChat (`lookIntoFuture=0` + `lastKnownMessageId`)
-/// that fetches the page of messages *older* than a given id. Bypasses [TalkApi]
+/// that fetches the page of messages *older* than a given id. The server
-/// because that layer treats non-2xx as errors, and the server answers HTTP 304
+/// answers HTTP 304 when there are no older messages left — a normal "start of
-/// when there are no older messages left — a normal "start of chat" outcome here.
+/// chat" outcome (see [fetchChatPage]). `setReadMarker=off` so paging into
-/// `setReadMarker=off` so paging into history never moves the read cursor.
+/// history never moves the read cursor.
 class GetChatHistory {
   final String chatToken;
   final int lastKnownMessageId;
@@ -24,39 +19,18 @@ class GetChatHistory {
   });
 
   /// Returns the older page, or `null` on HTTP 304 (no older messages).
-  Future<GetChatResponse?> run() async {
+  Future<GetChatResponse?> run() => fetchChatPage(
-    final params = GetChatParams(
+    label: 'GetChatHistory',
+    chatToken: chatToken,
+    params: GetChatParams(
       lookIntoFuture: GetChatParamsSwitch.off,
       lastKnownMessageId: lastKnownMessageId,
       includeLastKnown: GetChatParamsSwitch.off,
       setReadMarker: GetChatParamsSwitch.off,
       limit: limit,
-    );
+    ),
-    final uri = NextcloudOcs.uri(
-      'apps/spreed/api/v1/chat/$chatToken',
-      queryParameters: params.toJson(),
-    );
-    final headers = NextcloudOcs.headers();
-
-    final response = (await sendGuarded(
-      'GetChatHistory $uri',
-      () => http.get(uri, headers: headers),
-    ))!;
-
-    final status = response.statusCode;
-    if (status == 304) return null;
-    if (status >= 200 && status < 300) {
     // A page holds up to 200 messages and lands while the user is scrolling;
     // decoding it on the UI isolate stalls the fling.
-      final parsed = await compute(_parseChatResponse, response.body);
+    parseOffIsolate: true,
-      return parsed..headers = response.headers;
-    }
-    throw ServerException(
-      statusCode: status,
-      technicalDetails: 'GetChatHistory $uri: HTTP $status',
   );
 }
-}
-
-GetChatResponse _parseChatResponse(String body) =>
-    GetChatResponse.fromJson(NextcloudOcs.decode(body));

lib/api/marianumcloud/talk/chat/long_poll_chat.dart

@@ -1,15 +1,10 @@
-import 'package:http/http.dart' as http;
+import 'fetch_chat_page.dart';
-
-import '../../../errors/server_exception.dart';
-import '../../../http_errors.dart';
-import '../../nextcloud_ocs.dart';
 import 'get_chat_params.dart';
 import 'get_chat_response.dart';
 
-/// Long-poll variant of GetChat (`lookIntoFuture=1`). Bypasses [TalkApi]
+/// Long-poll variant of GetChat (`lookIntoFuture=1`); HTTP 304 is the normal
-/// because that layer treats non-2xx as errors, and we need 304 to be a
+/// "no new messages" outcome (see [fetchChatPage]). `setReadMarker=on` lets
-/// normal "no new messages" outcome. `setReadMarker=on` lets the server
+/// the server move the read cursor whenever the call returns messages.
-/// move the read cursor whenever the call returns messages.
 class LongPollChat {
   final String chatToken;
   final int lastKnownMessageId;
@@ -22,37 +17,17 @@ class LongPollChat {
   });
 
   /// Returns the response, or `null` on HTTP 304 (server timeout, nothing new).
-  Future<GetChatResponse?> run() async {
+  Future<GetChatResponse?> run() => fetchChatPage(
-    final params = GetChatParams(
+    label: 'LongPollChat',
+    chatToken: chatToken,
+    params: GetChatParams(
       lookIntoFuture: GetChatParamsSwitch.on,
       timeout: timeoutSeconds,
       lastKnownMessageId: lastKnownMessageId,
       includeLastKnown: GetChatParamsSwitch.off,
       setReadMarker: GetChatParamsSwitch.on,
       limit: 100,
-    );
+    ),
-    final uri = NextcloudOcs.uri(
+    timeout: Duration(seconds: timeoutSeconds + 15),
-      'apps/spreed/api/v1/chat/$chatToken',
-      queryParameters: params.toJson(),
-    );
-    final headers = NextcloudOcs.headers();
-
-    final response = (await sendGuarded(
-      'LongPollChat $uri',
-      () => http
-          .get(uri, headers: headers)
-          .timeout(Duration(seconds: timeoutSeconds + 15)),
-    ))!;
-
-    final status = response.statusCode;
-    if (status == 304) return null;
-    if (status >= 200 && status < 300) {
-      return GetChatResponse.fromJson(NextcloudOcs.decode(response.body))
-        ..headers = response.headers;
-    }
-    throw ServerException(
-      statusCode: status,
-      technicalDetails: 'LongPollChat $uri: HTTP $status',
   );
 }
-}

lib/api/marianumcloud/talk/get_participants/get_participants.dart

@@ -1,5 +1,3 @@
-import 'package:http/http.dart' as http;
-
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_participants_response.dart';
@@ -11,11 +9,4 @@ class GetParticipants extends TalkApi<GetParticipantsResponse> {
   @override
   GetParticipantsResponse assemble(String raw) =>
       GetParticipantsResponse.fromJson(NextcloudOcs.decode(raw));
-
-  @override
-  Future<http.Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/get_poll/get_poll_state.dart

@@ -1,5 +1,3 @@
-import 'package:http/http.dart' as http;
-
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_poll_state_response.dart';
@@ -13,11 +11,4 @@ class GetPollState extends TalkApi<GetPollStateResponse> {
   @override
   GetPollStateResponse assemble(String raw) =>
       GetPollStateResponse.fromJson(NextcloudOcs.decode(raw));
-
-  @override
-  Future<http.Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/get_reactions/get_reactions.dart

@@ -1,7 +1,3 @@
-import 'package:http/http.dart' as http;
-import 'package:http/http.dart';
-
-import '../../../api_params.dart';
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_reactions_response.dart';
@@ -15,11 +11,4 @@ class GetReactions extends TalkApi<GetReactionsResponse> {
   @override
   GetReactionsResponse assemble(String raw) =>
       GetReactionsResponse.fromJson(NextcloudOcs.decode(raw));
-
-  @override
-  Future<Response>? request(
-    Uri uri,
-    ApiParams? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/get_shared_items/get_shared_items.dart

@@ -1,5 +1,3 @@
-import 'package:http/http.dart' as http;
-
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_shared_items_response.dart';
@@ -30,11 +28,4 @@ class GetSharedItems extends TalkApi<GetSharedItemsResponse> {
   @override
   GetSharedItemsResponse assemble(String raw) =>
       GetSharedItemsResponse.fromOcs(NextcloudOcs.decode(raw));
-
-  @override
-  Future<http.Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/get_shared_items/get_shared_items_overview.dart

@@ -1,5 +1,3 @@
-import 'package:http/http.dart' as http;
-
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
 import 'get_shared_items_overview_response.dart';
@@ -18,11 +16,4 @@ class GetSharedItemsOverview extends TalkApi<GetSharedItemsOverviewResponse> {
   @override
   GetSharedItemsOverviewResponse assemble(String raw) =>
       GetSharedItemsOverviewResponse.fromOcs(NextcloudOcs.decode(raw));
-
-  @override
-  Future<http.Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }

lib/api/marianumcloud/talk/room/get_room.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/foundation.dart';
-import 'package:http/http.dart' as http;
 
 import '../../nextcloud_ocs.dart';
 import '../talk_api.dart';
@@ -17,13 +16,6 @@ class GetRoom extends TalkApi<GetRoomResponse> {
   @override
   Future<GetRoomResponse> assembleAsync(String raw) =>
       compute(_parseRooms, raw);
-
-  @override
-  Future<http.Response> request(
-    Uri uri,
-    Object? body,
-    Map<String, String>? headers,
-  ) => http.get(uri, headers: headers);
 }
 
 GetRoomResponse _parseRooms(String raw) =>

lib/api/marianumcloud/talk/talk_api.dart

@@ -23,11 +23,12 @@ abstract class TalkApi<T extends ApiResponse?> {
 
   TalkApi(this.path, this.body, {this.headers, this.getParameters});
 
+  /// Defaults to a plain GET; endpoints with a body or another verb override it.
   Future<http.Response>? request(
     Uri uri,
     ApiParams? body,
     Map<String, String>? headers,
-  );
+  ) => http.get(uri, headers: headers);
   T assemble(String raw);
 
   /// Override to parse large payloads off the UI isolate (e.g. via `compute`

lib/api/marianumconnect/auth/token_storage.dart

@@ -81,8 +81,8 @@ class MarianumConnectTokenStorage {
   }
 
   Future<void> clear() async {
-    await _storage.delete(key: _tokenKey);
+    for (final key in fieldKeys) {
-    await _storage.delete(key: _tokenIdKey);
+      await _storage.delete(key: key);
-    await _storage.delete(key: _expiresAtKey);
+    }
   }
 }

lib/api/marianumconnect/client_platform.dart

@@ -0,0 +1,8 @@
+import 'dart:io';
+
+/// Platform wire value MarianumConnect expects (`android`/`ios`), null elsewhere.
+String? clientPlatform() {
+  if (Platform.isAndroid) return 'android';
+  if (Platform.isIOS) return 'ios';
+  return null;
+}

lib/api/marianumconnect/queries/get_ticker_page/get_ticker_page.dart

@@ -2,8 +2,8 @@ import 'dart:convert';
 
 import 'package:dio/dio.dart';
 
+import '../../../errors/app_exception.dart';
 import '../../../errors/ticker_content_unavailable_exception.dart';
-import '../../errors/marianumconnect_error.dart';
 import '../../marianumconnect_query.dart';
 import 'get_ticker_page_response.dart';
 
@@ -14,26 +14,20 @@ import 'get_ticker_page_response.dart';
 /// 404 `{ "error": "CONTENT_UNAVAILABLE", "webUrl": ... }`; that case is mapped
 /// to a dedicated [TickerContentUnavailableException] carrying the browser
 /// fallback URL, so the detail screen can offer "open in browser" instead of a
-/// generic error. The bespoke 404 handling is why this keeps its own try/catch
+/// generic error.
-/// instead of the base [guard].
 class GetTickerPage extends MarianumConnectQuery {
   final String slug;
 
   GetTickerPage(this.slug, {super.dio});
 
-  Future<TickerPageResponse> run() async {
+  Future<TickerPageResponse> run() => getObject(
-    try {
+    'ticker/pages/${Uri.encodeComponent(slug)}',
-      final response = await dio.get<Map<String, dynamic>>(
+    TickerPageResponse.fromJson,
-        endpoint('ticker/pages/${Uri.encodeComponent(slug)}'),
   );
-      return TickerPageResponse.fromJson(response.data!);
-    } on DioException catch (e) {
-      throw _mapError(e);
-    }
-  }
 
-  Object _mapError(DioException e) {
+  @override
-    final response = e.response;
+  AppException mapError(DioException error) {
+    final response = error.response;
     if (response?.statusCode == 404) {
       final body = _asMap(response?.data);
       if (body != null && body['error'] == 'CONTENT_UNAVAILABLE') {
@@ -44,7 +38,7 @@ class GetTickerPage extends MarianumConnectQuery {
         );
       }
     }
-    return mapMarianumConnectError(e);
+    return super.mapError(error);
   }
 
   Map<String, dynamic>? _asMap(dynamic data) {

lib/api/marianumconnect/queries/report_client_error/client_error_reporter.dart

@@ -1,10 +1,10 @@
 import 'dart:async';
 import 'dart:developer';
-import 'dart:io';
 
 import 'package:flutter/foundation.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
+import '../../client_platform.dart';
 import 'report_client_error.dart';
 
 /// Fire-and-forget bridge from the app's global error handlers to the
@@ -61,7 +61,7 @@ class ClientErrorReporter {
         message: message,
         stacktrace: stacktrace,
         context: context,
-        platform: _platform(),
+        platform: clientPlatform(),
         appVersion: _appVersion,
       );
     } catch (e) {
@@ -73,10 +73,4 @@ class ClientErrorReporter {
     final normalized = message.toLowerCase().replaceAll(RegExp(r'\d+'), '#');
     return '$errorType|$normalized|${context ?? ''}';
   }
-
-  static String? _platform() {
-    if (Platform.isAndroid) return 'android';
-    if (Platform.isIOS) return 'ios';
-    return null;
-  }
 }

lib/api/marianumconnect/queries/submit_feedback/submit_feedback.dart

@@ -5,6 +5,7 @@ import 'dart:typed_data';
 import 'package:device_info_plus/device_info_plus.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
+import '../../client_platform.dart';
 import '../../marianumconnect_query.dart';
 
 /// Submits user feedback to MarianumConnect (`POST me/feedback`, bearer-auth).
@@ -27,7 +28,7 @@ class SubmitFeedback extends MarianumConnectQuery {
         'message': message,
         'screenshot': ?screenshotBase64,
         'screenshotContentType': screenshot != null ? screenshotContentType : null,
-        'platform': _platform(),
+        'platform': clientPlatform(),
         'appVersion': package.version,
         'appBuild': int.tryParse(package.buildNumber),
         'deviceModel': await _deviceModel(),
@@ -35,12 +36,6 @@ class SubmitFeedback extends MarianumConnectQuery {
     );
   });
 
-  static String? _platform() {
-    if (Platform.isAndroid) return 'android';
-    if (Platform.isIOS) return 'ios';
-    return null;
-  }
-
   static Future<String?> _deviceModel() async {
     try {
       final info = DeviceInfoPlugin();

lib/app.dart

@@ -80,6 +80,25 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     }
   }
 
+  /// Shares one debounce key, so a later emit supersedes a pending publish.
+  void _scheduleWidgetPublish(TimetableState data, Duration delay) {
+    final settingsCubit = context.read<SettingsCubit>();
+    final capabilitiesCubit = context.read<CapabilitiesCubit>();
+    final epoch = SessionManager().sessionEpoch;
+    Debouncer.debounce(
+      'widgetPublish',
+      delay,
+      () => unawaited(
+        WidgetPublisher.publishFromBlocState(
+          data,
+          settings: settingsCubit.val(),
+          isTeacher: capabilitiesCubit.isTeacher,
+          epoch: epoch,
+        ),
+      ),
+    );
+  }
+
   void _reportTelemetry() {
     if (!mounted) return;
     TelemetryHeartbeat.report(
@@ -125,13 +144,18 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     final pending = await WidgetNavigation.consumePendingTimetableTap();
     if (!pending || !mounted) return;
     // `withNavBar: false` routes sit on the root navigator above the
-    // bottom-nav; pop them so jumpToTab is actually visible. Stop at
+    // bottom-nav; pop them so jumpToTab is actually visible.
-    // popups so open dialogs/sheets stay alive.
+    _popToShell();
+    AppRoutes.goToTab(context, Modules.timetable);
+  }
+
+  /// Pops full-page routes back to the tab shell, stopping at popups so open
+  /// dialogs/sheets stay alive.
+  void _popToShell() {
     final navigator = Navigator.of(context);
     if (navigator.canPop()) {
       navigator.popUntil((route) => route.isFirst || route is PopupRoute);
     }
-    AppRoutes.goToTab(context, Modules.timetable);
   }
 
   void _handlePendingShare() {
@@ -140,10 +164,7 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     if (share == null || ShareIntentListener.instance.isShown(share)) return;
     // A second share would otherwise leave the previous share-flow page
     // on top with stale (already-cleared) file paths.
-    final navigator = Navigator.of(context);
+    _popToShell();
-    if (navigator.canPop()) {
-      navigator.popUntil((route) => route.isFirst || route is PopupRoute);
-    }
     ShareIntentListener.instance.markShown(share);
     AppRoutes.openShareTarget(context, share);
   }
@@ -166,27 +187,13 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       timetable.refresh();
       // Mirror BLoC updates into the home-screen widget without waiting
       // for the periodic background refresh.
-      final settingsCubit = context.read<SettingsCubit>();
-      final capabilitiesCubit = context.read<CapabilitiesCubit>();
       _timetableWidgetSync?.cancel();
       // Debounced: a refresh or week swipe emits several times in a row, and
       // only the settled state is worth mirroring.
       _timetableWidgetSync = timetable.stream.listen((state) {
         final data = state.data;
         if (data is TimetableState && !state.isLoading) {
-          final epoch = SessionManager().sessionEpoch;
+          _scheduleWidgetPublish(data, const Duration(seconds: 1));
-          Debouncer.debounce(
-            'widgetPublish',
-            const Duration(seconds: 1),
-            () => unawaited(
-              WidgetPublisher.publishFromBlocState(
-                data,
-                settings: settingsCubit.val(),
-                isTeacher: capabilitiesCubit.isTeacher,
-                epoch: epoch,
-              ),
-            ),
-          );
         }
       });
       // Initial publish in case hydrated storage already has data. The widget
@@ -194,19 +201,7 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       // frames are done (a fresh bloc emit in the meantime supersedes it).
       final initialData = timetable.state.data;
       if (initialData is TimetableState) {
-        final epoch = SessionManager().sessionEpoch;
+        _scheduleWidgetPublish(initialData, const Duration(seconds: 3));
-        Debouncer.debounce(
-          'widgetPublish',
-          const Duration(seconds: 3),
-          () => unawaited(
-            WidgetPublisher.publishFromBlocState(
-              initialData,
-              settings: settingsCubit.val(),
-              isTeacher: capabilitiesCubit.isTeacher,
-              epoch: epoch,
-            ),
-          ),
-        );
       }
       unawaited(_handlePendingWidgetNavigation());
       ShareIntentListener.pending.addListener(_handlePendingShare);

lib/background/widget_background_task.dart

@@ -17,7 +17,6 @@ import '../api/marianumconnect/queries/timetable_get_timegrid/timetable_get_time
 import '../api/marianumconnect/queries/timetable_get_timegrid/timetable_get_timegrid_response.dart';
 import '../api/marianumconnect/queries/timetable_get_week/timetable_get_week.dart';
 import '../api/mhsl/custom_timetable_event/get/get_custom_timetable_event_response.dart';
-import '../session/session.dart';
 import '../session/session_manager.dart';
 import '../widget_data/widget_data_mapper.dart';
 import '../widget_data/widget_publisher.dart';
@@ -81,16 +80,12 @@ class WidgetBackgroundTask {
   /// Throws on fetch failure so the worker path can signal a retry.
   static Future<void> runRefreshNow({bool force = false}) async {
     await WidgetSync.ensureInitialized();
-    Session? session;
-    try {
     // Bounded: a hanging keystore read must not stall the caller's budget
     // (FCM handler ~25s on iOS) forever.
-      session = await SessionManager().waitForLoad().timeout(
+    final session = await SessionManager().waitForLoad().timeout(
       const Duration(seconds: 10),
+      onTimeout: () => null,
     );
-    } on TimeoutException {
-      session = null;
-    }
     if (session == null) {
       // Deliberately does NOT flip the widget to logged-out: a failed or slow
       // keychain read (locked iOS device during the 06:00 silent push) is
@@ -143,7 +138,6 @@ void _callbackDispatcher() {
 }
 
 Future<void> _refresh() async {
-  await WidgetSync.ensureInitialized();
   // The background isolate doesn't go through main.dart's BlocBuilder, so we
   // re-apply the endpoint the foreground last persisted. Without this the
   // dio singleton would fall back to its hardcoded live default even when
@@ -191,26 +185,13 @@ Future<void> _refresh() async {
   final timegrid = await timegridFuture;
   final customEvents = await customEventsFuture;
 
-  final lessons = timetable.entries;
-
   final [connectDouble, isTeacher] = await Future.wait([
     WidgetSync.getConnectDoubleLessons(),
     WidgetSync.getIsTeacher(),
   ]);
-  final dayData = WidgetDataMapper.buildDayData(
+  final (day: dayData, week: weekData) = WidgetDataMapper.buildSnapshot(
     now: now,
-    lessons: lessons,
+    lessons: timetable.entries,
-    subjects: subjects,
-    rooms: rooms,
-    holidays: holidays,
-    timegrid: timegrid,
-    customEvents: customEvents,
-    connectDoubleLessons: connectDouble,
-    showClassInsteadOfTeacher: isTeacher,
-  );
-  final weekData = WidgetDataMapper.buildWeekData(
-    now: now,
-    lessons: lessons,
     subjects: subjects,
     rooms: rooms,
     holidays: holidays,
@@ -220,10 +201,7 @@ Future<void> _refresh() async {
     showClassInsteadOfTeacher: isTeacher,
   );
 
-  await WidgetSync.writeDayData(dayData);
+  await WidgetSync.publishSnapshot(day: dayData, week: weekData);
-  await WidgetSync.writeWeekData(weekData);
-  await WidgetSync.setLoggedIn(true);
-  await WidgetSync.triggerUpdate();
   log(
     '[widget-bg] refreshed: day=${dayData.lessons.length} '
     'week=${weekData.lessons.length}',

lib/extensions/date_time.dart

@@ -72,9 +72,7 @@ extension DateTimeFormatting on DateTime {
 
   String formatDateRelativeShort({DateTime? now}) {
     final reference = now ?? DateTime.now();
-    final today = DateTime(reference.year, reference.month, reference.day);
+    final diff = reference.dateOnly.difference(dateOnly).inDays;
-    final self = DateTime(year, month, day);
-    final diff = today.difference(self).inDays;
 
     if (diff == 0) return 'Heute';
     if (diff == 1) return 'Gestern';

lib/notification/notification_controller.dart

@@ -15,7 +15,7 @@ import '../widget/info_dialog.dart';
 import 'notification_tasks.dart';
 
 /// Bridges FCM lifecycle callbacks to the push pipeline. Background messages are
-/// handled directly by [PushMessageHandler.onBackgroundMessage]; this class
+/// handled directly by `pushOnBackgroundMessage`; this class
 /// covers the foreground and app-opened paths where a [BuildContext] is
 /// available.
 class NotificationController {

lib/notification/notification_tasks.dart

@@ -27,17 +27,13 @@ class NotificationTasks {
     }
   }
 
-  /// Per-chat tag scheme — canonical definition lives beside the stacked
-  /// notification id in chat_thread_store.dart.
-  static String chatTag(String chatToken) => chatNotificationTag(chatToken);
-
   /// Removes tray notifications belonging to [chatToken]. Eraser handles
   /// iOS (where the plugin's `getActiveNotifications` returns null ids
   /// for FCM posts and can't cancel them); the local-notifications sweep
   /// handles Android and acts as a fallback while Eraser's native side
   /// isn't built in yet.
   static Future<void> clearNotificationsForChat(String chatToken) async {
-    final tag = chatTag(chatToken);
+    final tag = chatNotificationTag(chatToken);
     try {
       await Eraser.clearAppNotificationsByTag(tag);
     } on MissingPluginException {

lib/push/chat_thread_store.dart

@@ -6,13 +6,20 @@ import 'package:localstore/localstore.dart';
 /// notification, small enough to stay cheap in the background isolate.
 const int kChatThreadCap = 15;
 
-/// Canonical per-chat notification tag (kept in sync with
+/// Canonical per-chat notification tag.
-/// `NotificationTasks.chatTag`, which delegates here).
 String chatNotificationTag(String chatToken) => 'talk_$chatToken';
 
 /// Deterministic non-negative 31-bit notification id per chat, so every
 /// message of the same conversation updates ONE stacked notification instead
 /// of adding a new card per push.
+final _fileSafeToken = RegExp(r'^[A-Za-z0-9_-]+$');
+
+/// File-/doc-safe name for a chat token: normally URL-safe and used verbatim,
+/// anything else is base64url-encoded so exotic ids can't escape a directory.
+String fileSafeToken(String chatToken) => _fileSafeToken.hasMatch(chatToken)
+    ? chatToken
+    : base64Url.encode(utf8.encode(chatToken)).replaceAll('=', '');
+
 int stableChatNotificationId(String chatToken) {
   var hash = 0;
   for (final unit in chatToken.codeUnits) {
@@ -128,12 +135,8 @@ class ChatThreadStore {
 
   ChatThreadStore({Localstore? db}) : _db = db ?? Localstore.instance;
 
-  /// Localstore doc ids become file names — tokens are normally URL-safe and
+  /// Localstore doc ids become file names.
-  /// used verbatim, anything else is base64url-encoded.
+  static String docIdForToken(String chatToken) => fileSafeToken(chatToken);
-  static String docIdForToken(String chatToken) =>
-      RegExp(r'^[A-Za-z0-9_-]+$').hasMatch(chatToken)
-      ? chatToken
-      : base64Url.encode(utf8.encode(chatToken)).replaceAll('=', '');
 
   Future<List<ThreadMessage>> messages(String chatToken) async {
     final data = await _doc(chatToken).get();
@@ -145,16 +148,6 @@ class ChatThreadStore {
         .toList();
   }
 
-  /// Appends [message] and returns the updated (capped) history.
-  Future<List<ThreadMessage>> append(
-    String chatToken,
-    ThreadMessage message,
-  ) async {
-    final updated = appendThreadMessage(await messages(chatToken), message);
-    await _write(chatToken, updated);
-    return updated;
-  }
-
   /// Appends [message], but restarts the thread first when the chat's previous
   /// notification is no longer active ([isActive] == false — dismissed/read).
   /// See [threadAfterIncoming] for the tri-state semantics.

lib/push/push_actions.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-import 'dart:convert';
 import 'dart:developer';
 import 'dart:ui';
 
@@ -13,6 +12,7 @@ import '../session/session_manager.dart';
 import 'chat_thread_store.dart';
 import 'nid_store.dart';
 import 'push_renderer.dart';
+import 'push_target.dart';
 
 /// Notification action identifiers shared between the renderer (which attaches
 /// the actions) and the response handlers (which dispatch them).
@@ -93,8 +93,7 @@ class PushActions {
           // the mark-read action does. Best effort: a failure here must not
           // fail the already-delivered reply.
           await markRead(chatToken);
-        }
+        } else {
-        if (!result.ok) {
           // Never swallow the typed message: surface the failure (and the
           // undelivered text) as its own notification. The nid mapping stays
           // alive — the thread notification is still in the tray.
@@ -287,14 +286,6 @@ class PushActions {
     return raw == null ? null : int.tryParse(raw);
   }
 
-  static String? _payloadField(String? payload, String key) {
+  static String? _payloadField(String? payload, String key) =>
-    if (payload == null || payload.isEmpty) return null;
+      decodeNotificationPayload(payload)?[key]?.toString();
-    try {
-      final map = jsonDecode(payload) as Map<String, dynamic>;
-      final value = map[key];
-      return value?.toString();
-    } on Object {
-      return null;
-    }
-  }
 }

lib/push/push_avatar.dart

@@ -9,6 +9,7 @@ import 'package:http/http.dart' as http;
 import 'package:path_provider/path_provider.dart';
 
 import '../api/marianumcloud/nextcloud_ocs.dart';
+import 'chat_thread_store.dart';
 
 /// Result of an avatar lookup at render time: [icon] when bytes are available
 /// within the fetch budget, otherwise [late] carries the still-running fetch
@@ -102,13 +103,7 @@ class PushAvatarStore {
     },
   );
 
-  /// File-safe cache name for a chat token. Tokens are normally URL-safe
+  static String fileNameForToken(String token) => fileSafeToken(token);
-  /// already and used verbatim; anything else is base64url-encoded so exotic
-  /// ids can never escape the cache directory.
-  static String fileNameForToken(String token) =>
-      RegExp(r'^[A-Za-z0-9_-]+$').hasMatch(token)
-      ? token
-      : base64Url.encode(utf8.encode(token)).replaceAll('=', '');
 
   /// Whether a cache file written at [modified] is still fresh at [now].
   static bool isFresh(DateTime modified, DateTime now) =>

lib/push/push_message_handler.dart

@@ -101,7 +101,6 @@ class PushMessageHandler {
       case PushKind.connect:
         await _handleConnect(
           message,
-          foreground: foreground,
           notificationsEnabled: notificationsEnabled,
         );
         break;
@@ -139,7 +138,6 @@ class PushMessageHandler {
 
   Future<void> _handleConnect(
     RemoteMessage message, {
-    required bool foreground,
     required bool notificationsEnabled,
   }) async {
     // Connect pushes carry no silent side effects, so nothing to do when the

lib/push/push_registration.dart

@@ -258,10 +258,9 @@ class PushRegistration {
   /// Flutter engine. Best-effort — a failure here must not abort registration.
   Future<void> _persistNativeAuthContext() async {
     try {
-      final endpoint = EndpointData().nextcloud();
       await _store.saveNativeAuthContext(
         username: SessionManager().requireNextcloud().username,
-        baseUrl: 'https://${endpoint.full()}',
+        baseUrl: currentNcBaseUrl,
       );
     } on Object catch (e) {
       log('Push: could not persist native auth context: $e');

lib/push/push_renderer.dart

@@ -203,16 +203,10 @@ class PushRenderer {
       messages: styleMessages,
     );
 
-    final androidDetails = AndroidNotificationDetails(
+    final androidDetails = _talkAndroidDetails(
-      talkChannelId,
-      talkChannelName,
-      importance: Importance.high,
-      priority: Priority.high,
-      category: AndroidNotificationCategory.message,
-      color: _accentColor,
       tag: tag,
+      style: messagingStyle,
       silent: !alert,
-      styleInformation: messagingStyle,
       actions: _talkActions,
     );
 
@@ -247,17 +241,11 @@ class PushRenderer {
       title: senderName,
       body: messageText,
       notificationDetails: NotificationDetails(
-        android: AndroidNotificationDetails(
+        android: _talkAndroidDetails(
-          talkChannelId,
-          talkChannelName,
-          importance: Importance.high,
-          priority: Priority.high,
-          category: AndroidNotificationCategory.message,
-          color: _accentColor,
           tag: tag,
           // Single sender ⇒ no conversationTitle (1:1 convention): the sender
           // Person is the header, a title would repeat the name per line.
-          styleInformation: MessagingStyleInformation(
+          style: MessagingStyleInformation(
             const Person(key: 'self', name: 'Ich'),
             groupConversation: false,
             messages: [
@@ -271,6 +259,25 @@ class PushRenderer {
     );
   }
 
+  static AndroidNotificationDetails _talkAndroidDetails({
+    required String tag,
+    required StyleInformation style,
+    AndroidNotificationCategory? category = AndroidNotificationCategory.message,
+    bool silent = false,
+    List<AndroidNotificationAction>? actions,
+  }) => AndroidNotificationDetails(
+    talkChannelId,
+    talkChannelName,
+    importance: Importance.high,
+    priority: Priority.high,
+    category: category,
+    color: _accentColor,
+    tag: tag,
+    silent: silent,
+    styleInformation: style,
+    actions: actions,
+  );
+
   // Both actions keep cancelNotification: true (the default): the plugin's
   // Java receiver then removes the card NATIVELY the moment the action fires.
   // The reply action must not rely on our Dart-side cancel instead — MIUI/
@@ -306,14 +313,10 @@ class PushRenderer {
       title: title,
       body: body,
       notificationDetails: NotificationDetails(
-        android: AndroidNotificationDetails(
+        android: _talkAndroidDetails(
-          talkChannelId,
-          talkChannelName,
-          importance: Importance.high,
-          priority: Priority.high,
-          color: _accentColor,
           tag: 'talk_error_$chatToken',
-          styleInformation: BigTextStyleInformation(body),
+          style: BigTextStyleInformation(body),
+          category: null,
         ),
         iOS: const DarwinNotificationDetails(),
       ),

lib/push/push_tap_router.dart

@@ -1,4 +1,3 @@
-import 'dart:convert';
 import 'dart:developer';
 
 import 'package:flutter/foundation.dart';
@@ -25,7 +24,7 @@ class PushTapRouter {
       PushActions.handleBackgroundResponse(response);
       return;
     }
-    final map = _payloadMap(response.payload);
+    final map = decodeNotificationPayload(response.payload);
     if (map == null) return;
     final target = resolvePushTarget(map);
     if (target != null) pendingTarget.value = target;
@@ -50,13 +49,4 @@ class PushTapRouter {
       log('Reading the notification launch details failed: $e');
     }
   }
-
-  static Map<String, dynamic>? _payloadMap(String? payload) {
-    if (payload == null || payload.isEmpty) return null;
-    try {
-      return jsonDecode(payload) as Map<String, dynamic>;
-    } on Object {
-      return null;
-    }
-  }
 }

lib/push/push_target.dart

@@ -1,3 +1,16 @@
+import 'dart:convert';
+
+/// Decodes the JSON payload of a locally rendered notification; null when
+/// absent or malformed.
+Map<String, dynamic>? decodeNotificationPayload(String? payload) {
+  if (payload == null || payload.isEmpty) return null;
+  try {
+    return jsonDecode(payload) as Map<String, dynamic>;
+  } on Object {
+    return null;
+  }
+}
+
 /// Where a tapped notification leads.
 sealed class PushTarget {
   const PushTarget();

lib/routing/app_routes.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 
+import 'package:collection/collection.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
@@ -145,19 +146,17 @@ class AppRoutes {
   /// the selected element (or null if dismissed). The timetable view renders
   /// the chosen plan inline. Gated behind the `viewForeignTimetables`
   /// capability at the call site.
-  static Future<TimetableElementRef?> openElementPicker(
+  static Future<TimetableElementRef?> openElementPicker(BuildContext context) =>
+      _pushForResult(context, const ElementPickerPage());
+
+  // pushScreen casts its internal MaterialPageRoute to `Route<T>`, which blows
+  // up for a concrete (record) T — so push untyped (T = dynamic, like every
+  // other caller) and cast the popped result ourselves.
+  static Future<T?> _pushForResult<T>(
     BuildContext context,
-  ) async {
+    Widget screen,
-    // pushScreen casts its internal MaterialPageRoute to `Route<T>`, which
+  ) async =>
-    // blows up for a concrete (record) T — so push untyped (T = dynamic, like
+      (await pushScreen(context, withNavBar: false, screen: screen)) as T?;
-    // every other caller) and cast the popped result ourselves.
-    final result = await pushScreen(
-      context,
-      withNavBar: false,
-      screen: const ElementPickerPage(),
-    );
-    return result as TimetableElementRef?;
-  }
 
   /// Opens the user/group picker for sharing a file and resolves to the chosen
   /// recipient (or null if dismissed). Which kinds are offered is gated by the
@@ -166,19 +165,10 @@ class AppRoutes {
     BuildContext context, {
     required bool allowUsers,
     required bool allowGroups,
-  }) async {
+  }) => _pushForResult(
-    // Push untyped (T = dynamic) and cast the popped result ourselves —
-    // pushScreen can't carry a concrete non-Widget T (see openElementPicker).
-    final result = await pushScreen(
     context,
-      withNavBar: false,
+    ShareePickerPage(allowUsers: allowUsers, allowGroups: allowGroups),
-      screen: ShareePickerPage(
-        allowUsers: allowUsers,
-        allowGroups: allowGroups,
-      ),
   );
-    return result as ShareeRef?;
-  }
 
   static void openMarianumMessage(
     BuildContext context,
@@ -452,13 +442,7 @@ class AppRoutes {
   static GetRoomResponseObject? _findRoomByToken(
     GetRoomResponse? rooms,
     String token,
-  ) {
+  ) => rooms?.data.firstWhereOrNull((room) => room.token == token);
-    if (rooms == null) return null;
-    for (final room in rooms.data) {
-      if (room.token == token) return room;
-    }
-    return null;
-  }
 
   /// Pushes a module from the "Mehr" tab list. Modules already in the bottom
   /// bar are switched to via [goToTab] instead.

lib/share_intent/pending_share.dart

@@ -19,7 +19,6 @@ class PendingShare {
 
   bool get hasFiles => filePaths.isNotEmpty;
   bool get hasText => text != null && text!.isNotEmpty;
-  bool get isEmpty => !hasFiles && !hasText;
 
   /// True when [other] carries the same payload. The iOS Share Extension
   /// fires two `open(url)` requests per share (see ShareViewController), so

lib/state/app/infrastructure/loadable_state/view/loadable_state_consumer.dart

@@ -40,7 +40,7 @@ class LoadableStateConsumer<
     super.key,
   });
 
-  static Duration animationDuration = const Duration(milliseconds: 200);
+  static const Duration animationDuration = Duration(milliseconds: 200);
 
   @override
   Widget build(BuildContext context) {

lib/state/app/infrastructure/loadable_state/view/loadable_state_error_bar.dart

@@ -5,6 +5,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../../../../../widget/info_dialog.dart';
 import '../bloc/loadable_state_bloc.dart';
+import 'loadable_state_consumer.dart';
 
 class LoadableStateErrorBar extends StatelessWidget {
   final bool visible;
@@ -21,8 +22,6 @@ class LoadableStateErrorBar extends StatelessWidget {
     super.key,
   });
 
-  final Duration animationDuration = const Duration(milliseconds: 200);
-
   @override
   Widget build(BuildContext context) {
     final bloc = context.watch<LoadableStateBloc>();
@@ -31,9 +30,9 @@ class LoadableStateErrorBar extends StatelessWidget {
     final shouldShow = visible || isOfflineWithCache;
 
     return AnimatedSize(
-      duration: animationDuration,
+      duration: LoadableStateConsumer.animationDuration,
       child: AnimatedSwitcher(
-        duration: animationDuration,
+        duration: LoadableStateConsumer.animationDuration,
         transitionBuilder: (Widget child, Animation<double> animation) =>
             SlideTransition(
               position: Tween<Offset>(
@@ -46,16 +45,12 @@ class LoadableStateErrorBar extends StatelessWidget {
           key: Key(shouldShow.hashCode.toString()),
           visible: shouldShow,
           replacement: const SizedBox(width: double.infinity),
-          child: Builder(
+          child: InkWell(
-            builder: (context) {
-              var bloc = context.watch<LoadableStateBloc>();
-              return InkWell(
             onTap: () {
               if (!bloc.isConnected()) return;
               final body = [
                 if (message != null && message!.isNotEmpty) message!,
-                    if (technicalDetails != null &&
+                if (technicalDetails != null && technicalDetails!.isNotEmpty)
-                        technicalDetails!.isNotEmpty)
                   technicalDetails!,
               ].join('\n\n');
               if (body.isEmpty) return;
@@ -68,13 +63,9 @@ class LoadableStateErrorBar extends StatelessWidget {
             },
             child: Container(
               height: 20,
-                  decoration: BoxDecoration(
+              decoration: BoxDecoration(color: bloc.connectionColor(context)),
-                    color: bloc.connectionColor(context),
-                  ),
               child: LoadableStateErrorBarText(lastUpdated: lastUpdated),
             ),
-              );
-            },
           ),
         ),
       ),
@@ -106,8 +97,9 @@ class _LoadableStateErrorBarTextState extends State<LoadableStateErrorBarText> {
 
   @override
   Widget build(BuildContext context) {
-    var bloc = context.watch<LoadableStateBloc>();
+    final bloc = context.watch<LoadableStateBloc>();
     final foreground = bloc.connectionForegroundColor(context);
+    final text = bloc.connectionText(lastUpdated: widget.lastUpdated);
 
     // liveRegion, damit das Auftauchen des Offline-/Fehlerbanners angesagt wird;
     // Row-Semantik ausgeschlossen (Icon + Text) und Text über das explizite
@@ -115,17 +107,14 @@ class _LoadableStateErrorBarTextState extends State<LoadableStateErrorBarText> {
     return Semantics(
       liveRegion: true,
       container: true,
-      label: bloc.connectionText(lastUpdated: widget.lastUpdated),
+      label: text,
       child: ExcludeSemantics(
         child: Row(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
             Icon(bloc.connectionIcon(), size: 14, color: foreground),
             const SizedBox(width: 10),
-            Text(
+            Text(text, style: TextStyle(fontSize: 12, color: foreground)),
-              bloc.connectionText(lastUpdated: widget.lastUpdated),
-              style: TextStyle(fontSize: 12, color: foreground),
-            ),
           ],
         ),
       ),

lib/state/app/infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart

@@ -253,7 +253,6 @@ abstract class LoadableHydratedBloc<
   /// `==`, so use fields that compare cheaply, e.g. by identity).
   Object? persistenceKey(TState data) => data;
 
-
   Future<void> gatherData();
   TRepository repository();
 

lib/state/app/modules/app_modules.dart

@@ -177,9 +177,7 @@ class AppModule {
     for (final missing in Modules.values) {
       if (!seen.add(missing)) continue;
       var insertAt = 0;
-      for (final predecessor in Modules.values.takeWhile(
+      for (final predecessor in Modules.values.takeWhile((m) => m != missing)) {
-        (m) => m != missing,
-      )) {
         final pos = order.indexOf(predecessor);
         if (pos >= insertAt) insertAt = pos + 1;
       }
@@ -231,33 +229,26 @@ class AppModule {
   static const int minBottomBarSlots = 3;
   static const int maxBottomBarSlots = 5;
 
-  static int resolveBottomBarSlotCount(BuildContext context) {
+  static int _slotCount(BuildContext context, int available) {
     final settings = context.read<SettingsCubit>().val().modulesSettings;
-    final available = modules(context).length;
-
-    int desired;
-    if (settings.autoFillBottomBar) {
     // 4 content tabs so the bar shows 5 entries including "Mehr" — enough
     // for the Ticker module without pushing "Dateien" into the overflow.
-      desired = 4;
+    final desired = settings.autoFillBottomBar
-    } else {
+        ? 4
-      desired = settings.fixedBottomBarSlots;
+        : settings.fixedBottomBarSlots;
-    }
+    return desired
-
+        .clamp(minBottomBarSlots, maxBottomBarSlots)
-    desired = desired.clamp(minBottomBarSlots, maxBottomBarSlots);
+        .clamp(0, available);
-    return desired.clamp(0, available);
   }
 
   static List<AppModule> getBottomBarModules(BuildContext context) {
     final all = modules(context).values.toList();
-    final slots = resolveBottomBarSlotCount(context);
+    return all.take(_slotCount(context, all.length)).toList();
-    return all.take(slots).toList();
   }
 
   static List<AppModule> getOverhangModules(BuildContext context) {
     final all = modules(context).values.toList();
-    final slots = resolveBottomBarSlotCount(context);
+    return all.skip(_slotCount(context, all.length)).toList();
-    return all.skip(slots).toList();
   }
 
   Widget toListTile(
@@ -290,10 +281,7 @@ class AppModule {
         : const Icon(Icons.arrow_right),
   );
 
-  PersistentTabConfig toBottomTab(
+  PersistentTabConfig toBottomTab(BuildContext context) => PersistentTabConfig(
-    BuildContext context, {
-    Widget Function(IconData icon)? iconBuilder,
-  }) => PersistentTabConfig(
     screen: Breaker(breaker: breakerArea, child: create()),
     item: ItemConfig(
       activeForegroundColor: Theme.of(context).primaryColor,

lib/state/app/modules/chat/bloc/chat_bloc.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 import 'dart:developer';
-import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
 
@@ -10,6 +9,7 @@ import '../../../../../api/marianumcloud/talk/chat/long_poll_chat.dart';
 import '../../../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../../../api/marianumcloud/talk/set_read_marker/set_read_marker.dart';
 import '../../../../../api/marianumcloud/talk/set_read_marker/set_read_marker_params.dart';
+import '../../../../../utils/exponential_backoff.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
 import '../../chat_list/bloc/chat_list_bloc.dart';
@@ -26,7 +26,6 @@ class ChatBloc
   // A loop parked in its request survives stop+start for the same token
   // (pause/resume); the generation retires it so only one loop polls.
   int _pollGeneration = 0;
-  int _backoffMs = 0;
   int _lastKnownMessageId = 0;
   bool _appResumed = true;
 
@@ -68,8 +67,7 @@ class ChatBloc
   @override
   Map<String, dynamic>? toStorage(ChatState state) {
     final response = state.chatResponse;
-    if (response == null ||
+    if (response == null || response.data.length <= _kMaxPersistedMessages) {
-        response.data.length <= _kMaxPersistedMessages) {
       return state.toJson();
     }
     // Keep only the newest N; trimming drops older messages, so there is
@@ -129,9 +127,6 @@ class ChatBloc
     add(Emit((s) => s.copyWith(referenceMessageId: messageId)));
   }
 
-  /// No-op when the bloc has already moved on to a different token: when
-  /// popping a stacked chat (B over A), A's didPopNext runs setToken(A)
-  /// before B's dispose fires.
   /// The chat view may still be popping when the sign-out resets this bloc,
   /// so leaveChat would find no token and the long-poll would keep running.
   @override
@@ -141,6 +136,9 @@ class ChatBloc
     return super.reset();
   }
 
+  /// No-op when the bloc has already moved on to a different token: when
+  /// popping a stacked chat (B over A), A's didPopNext runs setToken(A)
+  /// before B's dispose fires.
   void leaveChat(String fromToken) {
     if ((innerState?.currentToken ?? '') != fromToken) return;
     _chatViewActive = false;
@@ -272,7 +270,6 @@ class ChatBloc
     if (_pollingToken == token) return;
     _stopLongPoll();
     _pollingToken = token;
-    _backoffMs = 0;
     _lastKnownMessageId = _maxMessageId(innerState?.chatResponse);
     unawaited(_pollLoop(token, ++_pollGeneration));
   }
@@ -280,11 +277,11 @@ class ChatBloc
   void _stopLongPoll() {
     _pollingToken = null;
     _pollGeneration++;
-    _backoffMs = 0;
   }
 
   Future<void> _pollLoop(String token, int generation) async {
     bool active() => generation == _pollGeneration && !isClosed;
+    var failures = 0;
     while (active()) {
       try {
         final response = await LongPollChat(
@@ -293,7 +290,7 @@ class ChatBloc
         ).run();
 
         if (!active()) return;
-        _backoffMs = 0;
+        failures = 0;
 
         if (response == null) continue;
 
@@ -318,8 +315,13 @@ class ChatBloc
       } on Object catch (e) {
         if (!active()) return;
         log('LongPoll error for $token: $e');
-        _backoffMs = _backoffMs == 0 ? 2000 : math.min(_backoffMs * 2, 30000);
+        await Future<void>.delayed(
-        await Future.delayed(Duration(milliseconds: _backoffMs));
+          exponentialBackoff(
+            ++failures,
+            base: const Duration(seconds: 2),
+            max: const Duration(seconds: 30),
+          ),
+        );
       }
     }
   }
@@ -339,14 +341,7 @@ class ChatBloc
       );
       return;
     }
-    final byId = <int, GetChatResponseObject>{};
+    final merged = _mergeById(current, incoming, incomingWins: true)
-    for (final m in current.data) {
-      byId[m.id] = m;
-    }
-    for (final m in incoming.data) {
-      byId[m.id] = m;
-    }
-    final merged = GetChatResponse(byId.values.toSet())
       ..headers = incoming.headers;
     add(DataGathered((s) => s.copyWith(chatResponse: merged)));
   }
@@ -357,14 +352,7 @@ class ChatBloc
   void _applyOlderResponse(GetChatResponse older) {
     final current = innerState?.chatResponse;
     if (current == null) return;
-    final byId = <int, GetChatResponseObject>{};
+    final merged = _mergeById(current, older, incomingWins: false)
-    for (final m in current.data) {
-      byId[m.id] = m;
-    }
-    for (final m in older.data) {
-      byId.putIfAbsent(m.id, () => m);
-    }
-    final merged = GetChatResponse(byId.values.toSet())
       ..headers = current.headers;
     add(
       DataGathered(
@@ -377,6 +365,22 @@ class ChatBloc
     );
   }
 
+  GetChatResponse _mergeById(
+    GetChatResponse current,
+    GetChatResponse incoming, {
+    required bool incomingWins,
+  }) {
+    final byId = {for (final m in current.data) m.id: m};
+    for (final m in incoming.data) {
+      if (incomingWins) {
+        byId[m.id] = m;
+      } else {
+        byId.putIfAbsent(m.id, () => m);
+      }
+    }
+    return GetChatResponse(byId.values.toSet());
+  }
+
   int _maxMessageId(GetChatResponse? response) {
     if (response == null) return 0;
     var max = 0;
@@ -386,8 +390,7 @@ class ChatBloc
     return max;
   }
 
-  int _minMessageId(GetChatResponse? response) {
+  int _minMessageId(GetChatResponse response) {
-    if (response == null) return 0;
     var min = 0;
     for (final m in response.data) {
       if (m.id <= 0) continue; // skip dummies

lib/state/app/modules/files/bloc/files_bloc.dart

@@ -28,18 +28,16 @@ class FilesBloc
   @override
   Map<String, dynamic>? toStorage(FilesState state) => null;
 
+  List<String> get _currentPath => innerState?.currentPath ?? initialPath;
+
   @override
-  Future<void> gatherData() async {
+  Future<void> gatherData() => _query(_currentPath);
-    final path = innerState?.currentPath ?? initialPath;
-    await _query(path);
-  }
 
   Future<void> refresh() async {
     add(RefetchStarted<FilesState>());
-    final path = innerState?.currentPath ?? initialPath;
     // Explicit user action — bypass the cache TTL so the root listing also
     // refetches even though it is otherwise cached for a day.
-    await _query(path, renew: true);
+    await _query(_currentPath, renew: true);
   }
 
   /// Pull-to-refresh and error-screen retry route through here. Unlike the
@@ -57,13 +55,15 @@ class FilesBloc
   }
 
   Future<void> createFolder(String name) async {
-    final path = innerState?.currentPath ?? initialPath;
+    await repo.data.createFolder('${_currentPath.join('/')}/$name');
-    await repo.data.createFolder('${path.join('/')}/$name');
     await refresh();
   }
 
   Future<void> _query(List<String> path, {bool renew = false}) async {
-    final pathString = path.isEmpty ? '/' : path.join('/');
+    // The listing contains the folder itself; only its children are shown.
+    void dropSelf(ListFilesResponse listing) => listing.files.removeWhere(
+      (file) => file.name.isEmpty || file.name == path.lastOrNull,
+    );
 
     // Drop late results when [setPath] has navigated elsewhere or when the
     // bloc has been disposed (e.g. share-flow picker closed mid-fetch). Both
@@ -80,16 +80,14 @@ class FilesBloc
     ListFilesResponse? listing;
     try {
       listing = await repo.data.listFiles(
-        pathString,
+        path.isEmpty ? '/' : path.join('/'),
         renew: renew,
         onCacheData: (cached) {
           if (isStale()) return;
           // Cached payload arrives before the network call settles. Surface it
           // immediately via Emit so the listing is visible while isLoading
           // stays true and the top loading bar keeps spinning.
-          cached.files.removeWhere(
+          dropSelf(cached);
-            (file) => file.name.isEmpty || file.name == path.lastOrNull,
-          );
           add(Emit((s) => s.copyWith(listing: cached)));
         },
         onRetry: (next, max) {
@@ -105,9 +103,7 @@ class FilesBloc
     if (isStale()) return;
 
     if (listing != null) {
-      listing.files.removeWhere(
+      dropSelf(listing);
-        (file) => file.name.isEmpty || file.name == path.lastOrNull,
-      );
       add(DataGathered((s) => s.copyWith(listing: listing)));
     }
     if (capturedError != null) addLoadingError(capturedError!);

lib/state/app/modules/files/repository/files_repository.dart

@@ -3,10 +3,5 @@ import '../bloc/files_state.dart';
 import '../data_provider/files_data_provider.dart';
 
 class FilesRepository extends Repository<FilesState> {
-  final FilesDataProvider _provider;
+  final FilesDataProvider data = FilesDataProvider();
-
-  FilesRepository([FilesDataProvider? provider])
-    : _provider = provider ?? FilesDataProvider();
-
-  FilesDataProvider get data => _provider;
 }

lib/state/app/modules/foreign_timetable/bloc/foreign_timetable_bloc.dart

@@ -1,16 +1,14 @@
-import 'dart:developer';
-
 import '../../../../../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';
 import '../../../../../api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
-import '../../../../../extensions/date_time.dart';
 import '../../../infrastructure/loadable_state/loadable_state.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
-import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
 import '../../timetable/bloc/timetable_event.dart';
 import '../../timetable/bloc/timetable_state.dart';
+import '../../timetable/bloc/timetable_week_loader.dart';
+import '../../timetable/data_provider/timetable_data_provider.dart';
 import '../repository/foreign_timetable_repository.dart';
 
-/// Drives a foreign element's timetable. Mirrors `TimetableBloc`'s week-loading
+/// Drives a foreign element's timetable. Shares `TimetableBloc`'s week loading
 /// and navigation but loads weeks from the element endpoint, carries no custom
 /// events, and does not persist (page-scoped, recreated per element). Reuses
 /// [TimetableState] verbatim so the render pipeline is unchanged; `customEvents`
@@ -21,34 +19,25 @@ class ForeignTimetableBloc
           TimetableEvent,
           TimetableState,
           ForeignTimetableRepository
-        > {
+        >
-
+    with TimetableWeekLoader<ForeignTimetableRepository> {
   final TimetableElementType type;
   // Named `elementId` rather than `id` to avoid shadowing HydratedMixin's
   // `String get id` (the storage key), which a plain `int id` would illegally
   // override.
   final int elementId;
-  final String title;
 
-  DateTime _lastWeekRequestStart = DateTime.fromMillisecondsSinceEpoch(0);
+  ForeignTimetableBloc({required this.type, required this.elementId});
-
-  ForeignTimetableBloc({
-    required this.type,
-    required this.elementId,
-    required this.title,
-  });
 
   @override
   ForeignTimetableRepository repository() => ForeignTimetableRepository();
 
   @override
-  TimetableState fromNothing() {
+  TimetableDataProvider get referenceData => repo.data.referenceData;
-    final reference = DateTime.now().addDays(2);
+
-    return TimetableState(
+  @override
-      startDate: reference.mondayOfWeek,
+  Future<TimetableGetWeekResponse> fetchWeek(DateTime start, DateTime end) =>
-      endDate: _endOfWeek(reference),
+      repo.data.getElementWeek(type, elementId, start, end);
-    );
-  }
 
   // Persistence disabled: page-scoped and element-specific, nothing worth
   // restoring. toJson returns null so nothing is written; fromJson starts fresh.
@@ -72,116 +61,5 @@ class ForeignTimetableBloc
   Map<String, dynamic>? toStorage(TimetableState state) => null;
 
   @override
-  Future<void> gatherData() async {
+  Future<void> gatherData() => gatherWeek();
-    final initial = innerState ?? fromNothing();
-
-    Object? firstError;
-    void recordError(Object e) {
-      firstError ??= e;
-    }
-
-    await Future.wait([
-      _loadCurrentWeek(initial.startDate, initial.endDate, onError: recordError),
-      _loadStaticReferenceData(onError: recordError),
-    ]);
-
-    if (firstError != null) throw firstError!;
-
-    add(DataGathered((s) => s));
-    _prefetchAdjacentWeeks(initial.startDate, initial.endDate);
-  }
-
-  void changeWeek(DateTime startDate, DateTime endDate) {
-    final current = innerState ?? fromNothing();
-    if (current.startDate == startDate && current.endDate == endDate) return;
-    add(Emit((s) => s.copyWith(startDate: startDate, endDate: endDate)));
-    _loadCurrentWeek(startDate, endDate);
-    _prefetchAdjacentWeeks(startDate, endDate);
-  }
-
-  void resetWeek() {
-    final reference = DateTime.now().addDays(2);
-    changeWeek(reference.mondayOfWeek, _endOfWeek(reference));
-  }
-
-  void refresh() => fetch();
-
-  Future<void> _loadCurrentWeek(
-    DateTime startDate,
-    DateTime endDate, {
-    void Function(Object)? onError,
-  }) async {
-    final requestStart = DateTime.now();
-    _lastWeekRequestStart = requestStart;
-    try {
-      final week = await repo.data.getElementWeek(
-        type,
-        elementId,
-        startDate,
-        endDate,
-        onError: onError,
-      );
-      if (_lastWeekRequestStart.isAfter(requestStart)) return;
-      _writeWeekToCache(startDate, week);
-    } catch (e) {
-      log('getElementWeek error for $startDate–$endDate: $e');
-      onError?.call(e);
-    }
-  }
-
-  Future<void> _loadStaticReferenceData({
-    void Function(Object)? onError,
-  }) async {
-    try {
-      final (rooms, subjects, schoolHolidays, schoolyear) = await (
-        repo.data.getRooms(onError: onError),
-        repo.data.getSubjects(onError: onError),
-        repo.data.getSchoolHolidays(onError: onError),
-        repo.data.getCurrentSchoolyear(onError: onError),
-      ).wait;
-
-      add(
-        Emit(
-          (s) => s.withReferenceData(
-            rooms: rooms,
-            subjects: subjects,
-            schoolHolidays: schoolHolidays,
-            schoolyear: schoolyear,
-          ),
-        ),
-      );
-    } catch (e) {
-      onError?.call(e);
-    }
-
-    try {
-      final timegrid = await repo.data.getTimegrid();
-      add(Emit((s) => s.withReferenceData(timegrid: timegrid)));
-    } catch (_) {
-      // Timegrid load failure falls back to a hardcoded schedule in the UI.
-    }
-  }
-
-  void _prefetchAdjacentWeeks(DateTime start, DateTime end) {
-    _prefetchWeek(start.subtractDays(7), end.subtractDays(7));
-    _prefetchWeek(start.addDays(7), end.addDays(7));
-  }
-
-  void _prefetchWeek(DateTime start, DateTime end) {
-    repo.data
-        .getElementWeek(type, elementId, start, end)
-        .then((week) => _writeWeekToCache(start, week))
-        .catchError((_) {});
-  }
-
-  void _writeWeekToCache(DateTime weekStart, TimetableGetWeekResponse week) {
-    add(Emit((s) => s.withFetchedWeek(weekStart, week)));
-  }
-
-  static DateTime _endOfWeek(DateTime reference) {
-    final friday = reference.addDays(
-      DateTime.daysPerWeek - reference.weekday - 2,
-    );
-    return DateTime(friday.year, friday.month, friday.day);
-  }
 }

lib/state/app/modules/foreign_timetable/data_provider/foreign_timetable_data_provider.dart

@@ -1,64 +1,27 @@
 import '../../../../../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';
 import '../../../../../api/marianumconnect/queries/timetable_get_element_week/timetable_get_element_week.dart';
-import '../../../../../api/marianumconnect/queries/timetable_get_holidays/timetable_get_holidays_response.dart';
-import '../../../../../api/marianumconnect/queries/timetable_get_rooms/timetable_get_rooms_response.dart';
-import '../../../../../api/marianumconnect/queries/timetable_get_schoolyear/timetable_get_schoolyear_response.dart';
-import '../../../../../api/marianumconnect/queries/timetable_get_subjects/timetable_get_subjects_response.dart';
-import '../../../../../api/marianumconnect/queries/timetable_get_timegrid/timetable_get_timegrid_response.dart';
 import '../../../../../api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
 import '../../timetable/data_provider/timetable_data_provider.dart';
 
 /// Data access for a foreign element's timetable. The week comes from the
 /// element-specific endpoint; all reference data (rooms/subjects/holidays/
-/// school year/timegrid) is school-wide, so it delegates to the existing
+/// school year/timegrid) is school-wide and comes from [referenceData].
-/// [TimetableDataProvider] (which caches it). Custom events are intentionally
+/// Custom events are intentionally absent — they are user-private.
-/// absent — they are user-private.
 class ForeignTimetableDataProvider {
-  final TimetableDataProvider _base;
+  final TimetableDataProvider referenceData;
 
-  ForeignTimetableDataProvider([TimetableDataProvider? base])
+  ForeignTimetableDataProvider([TimetableDataProvider? referenceData])
-    : _base = base ?? TimetableDataProvider();
+    : referenceData = referenceData ?? TimetableDataProvider();
 
   Future<TimetableGetWeekResponse> getElementWeek(
     TimetableElementType type,
     int id,
     DateTime startDate,
-    DateTime endDate, {
+    DateTime endDate,
-    void Function(Object)? onError,
+  ) async => TimetableGetElementWeek().run(
-  }) async {
-    try {
-      return await TimetableGetElementWeek().run(
     type: type,
     id: id,
     from: startDate,
     until: endDate,
   );
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
-
-  Future<TimetableGetRoomsResponse> getRooms({
-    void Function(Object)? onError,
-    bool renew = false,
-  }) => _base.getRooms(onError: onError, renew: renew);
-
-  Future<TimetableGetSubjectsResponse> getSubjects({
-    void Function(Object)? onError,
-    bool renew = false,
-  }) => _base.getSubjects(onError: onError, renew: renew);
-
-  Future<TimetableGetHolidaysResponse> getSchoolHolidays({
-    void Function(Object)? onError,
-    bool renew = false,
-  }) => _base.getSchoolHolidays(onError: onError, renew: renew);
-
-  Future<TimetableGetSchoolyearResponse> getCurrentSchoolyear({
-    void Function(Object)? onError,
-    bool renew = false,
-  }) => _base.getCurrentSchoolyear(onError: onError, renew: renew);
-
-  Future<TimetableGetTimegridResponse> getTimegrid({bool renew = false}) =>
-      _base.getTimegrid(renew: renew);
 }

lib/state/app/modules/holidays/bloc/holidays_bloc.dart

@@ -9,13 +9,13 @@ class HolidaysBloc
     extends
         LoadableHydratedBloc<HolidaysEvent, HolidaysState, HolidaysRepository> {
   HolidaysBloc() {
-    on<SetPastHolidaysVisible>((event, emit) {
+    on<SetPastHolidaysVisible>(
-      add(
+      (event, emit) => add(
         Emit(
           (state) => state.copyWith(showPastHolidays: event.shouldBeVisible),
         ),
+      ),
     );
-    });
 
     on<DisclaimerDismissed>(
       (event, emit) =>
@@ -25,15 +25,13 @@ class HolidaysBloc
 
   bool showPastHolidays() => innerState?.showPastHolidays ?? false;
   bool showDisclaimerOnEntry() => innerState?.showDisclaimer ?? false;
-  List<McHoliday>? getHolidays() =>
+  List<McHoliday> getHolidays() {
-      innerState?.holidays
+    final now = DateTime.now();
-          .where(
+    return innerState?.holidays
-            (element) =>
+            .where((h) => showPastHolidays() || h.endDate.isAfter(now))
-                showPastHolidays() ||
-                element.endDate.isAfter(DateTime.now()),
-          )
             .toList() ??
         [];
+  }
 
   @override
   HolidaysState fromNothing() => const HolidaysState(

lib/state/app/modules/marianum_dates/bloc/marianum_dates_bloc.dart

@@ -12,20 +12,22 @@ class MarianumDatesBloc
           MarianumDatesRepository
         > {
   MarianumDatesBloc() {
-    on<SetPastEventsVisible>((event, emit) {
+    on<SetPastEventsVisible>(
-      add(
+      (event, emit) => add(
         Emit((state) => state.copyWith(showPastEvents: event.shouldBeVisible)),
+      ),
     );
-    });
   }
 
   bool showPastEvents() => innerState?.showPastEvents ?? false;
 
-  List<MarianumDate>? getEvents() =>
+  List<MarianumDate> getEvents() {
-      innerState?.events
+    final now = DateTime.now();
-          .where((e) => showPastEvents() || e.end.isAfter(DateTime.now()))
+    return innerState?.events
+            .where((e) => showPastEvents() || e.end.isAfter(now))
             .toList() ??
         [];
+  }
 
   @override
   MarianumDatesState fromNothing() =>

lib/state/app/modules/marianum_message/bloc/marianum_message_event.dart

@@ -3,5 +3,3 @@ import 'marianum_message_state.dart';
 
 sealed class MarianumMessageEvent
     extends LoadableHydratedBlocEvent<MarianumMessageState> {}
-
-class MessageEvent extends MarianumMessageEvent {}

lib/state/app/modules/marianum_message/bloc/marianum_message_state.dart

@@ -37,5 +37,3 @@ abstract class MarianumMessage with _$MarianumMessage {
   factory MarianumMessage.fromJson(Map<String, dynamic> json) =>
       _$MarianumMessageFromJson(json);
 }
-
-enum GradeAveragesGradingSystem { highSchool, middleSchool }

lib/state/app/modules/marianum_message/data_provider/marianum_message_get_messages.dart

@@ -12,7 +12,8 @@ import '../bloc/marianum_message_state.dart';
 class MarianumMessageGetMessages {
   final Dio _dio;
 
-  MarianumMessageGetMessages({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
+  MarianumMessageGetMessages({Dio? dio})
+    : _dio = dio ?? MarianumConnectApi.dio();
 
   Future<MarianumMessageList> run() async {
     try {

lib/state/app/modules/ticker/bloc/ticker_event.dart

@@ -2,5 +2,3 @@ import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_
 import 'ticker_state.dart';
 
 sealed class TickerEvent extends LoadableHydratedBlocEvent<TickerState> {}
-
-class TickerLoadEvent extends TickerEvent {}

lib/state/app/modules/ticker/bloc/ticker_page_event.dart

@@ -1,6 +1,5 @@
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
 import 'ticker_page_state.dart';
 
-sealed class TickerPageEvent extends LoadableHydratedBlocEvent<TickerPageState> {}
+sealed class TickerPageEvent
-
+    extends LoadableHydratedBlocEvent<TickerPageState> {}
-class TickerPageLoadEvent extends TickerPageEvent {}

lib/state/app/modules/timetable/bloc/timetable_bloc.dart

@@ -1,14 +1,13 @@
-import 'dart:developer';
-
 import '../../../../../api/marianumconnect/queries/timetable_custom_events/custom_events_migration.dart';
 import '../../../../../api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
 import '../../../../../api/mhsl/custom_timetable_event/custom_timetable_event.dart';
-import '../../../../../extensions/date_time.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
+import '../data_provider/timetable_data_provider.dart';
 import '../repository/timetable_repository.dart';
 import 'timetable_event.dart';
 import 'timetable_state.dart';
+import 'timetable_week_loader.dart';
 
 class TimetableBloc
     extends
@@ -16,11 +15,10 @@ class TimetableBloc
           TimetableEvent,
           TimetableState,
           TimetableRepository
-        > {
+        >
-  DateTime _lastWeekRequestStart = DateTime.fromMillisecondsSinceEpoch(0);
+    with TimetableWeekLoader<TimetableRepository> {
-
+  /// Set by [retry] to force the next [gatherData] to bypass the custom-event
-  /// Set by [retry] to force the next [gatherData] to bypass cache freshness
+  /// cache and actually hit the network. Cleared at the top of [gatherData].
-  /// checks and actually hit the network. Cleared at the top of [gatherData].
   bool _forceRenew = false;
 
   @override
@@ -33,24 +31,21 @@ class TimetableBloc
   TimetableRepository repository() => TimetableRepository();
 
   @override
-  TimetableState fromNothing() {
+  TimetableDataProvider get referenceData => repo.data;
-    final reference = DateTime.now().addDays(2);
+
-    return TimetableState(
+  @override
-      startDate: reference.mondayOfWeek,
+  Future<TimetableGetWeekResponse> fetchWeek(DateTime start, DateTime end) =>
-      endDate: _endOfWeek(reference),
+      repo.data.getWeek(start, end);
-    );
-  }
 
   /// Persisted state may carry a stale `startDate`/`endDate` from the user's
   /// last view. Reset on every cold start so the calendar always mounts on
   /// the current week, not on whatever week the user closed the app on.
   @override
   TimetableState fromStorage(Map<String, dynamic> json) {
-    final stored = TimetableState.fromJson(json);
+    final (start, end) = currentTimetableWeek();
-    final reference = DateTime.now().addDays(2);
+    return TimetableState.fromJson(json).copyWith(
-    return stored.copyWith(
+      startDate: start,
-      startDate: reference.mondayOfWeek,
+      endDate: end,
-      endDate: _endOfWeek(reference),
       accessibleStartDate: null,
       accessibleEndDate: null,
     );
@@ -60,50 +55,14 @@ class TimetableBloc
   Map<String, dynamic>? toStorage(TimetableState state) => state.toJson();
 
   @override
-  Future<void> gatherData() async {
+  Future<void> gatherData() {
-    final initial = innerState ?? fromNothing();
     final renew = _forceRenew;
     _forceRenew = false;
-
+    return gatherWeek(
-    Object? firstError;
+      also: (onError) => _loadCustomEvents(onError: onError, renew: renew),
-    void recordError(Object e) {
+    );
-      firstError ??= e;
   }
 
-    await Future.wait([
-      _loadCurrentWeek(
-        initial.startDate,
-        initial.endDate,
-        onError: recordError,
-        renew: renew,
-      ),
-      _loadStaticReferenceData(onError: recordError, renew: renew),
-      _loadCustomEvents(onError: recordError, renew: renew),
-    ]);
-
-    if (firstError != null) throw firstError!;
-
-    add(DataGathered((s) => s));
-    _prefetchAdjacentWeeks(initial.startDate, initial.endDate);
-  }
-
-  void changeWeek(DateTime startDate, DateTime endDate) {
-    final current = innerState ?? fromNothing();
-    if (current.startDate == startDate && current.endDate == endDate) return;
-    add(Emit((s) => s.copyWith(startDate: startDate, endDate: endDate)));
-    runInSession(() {
-      _loadCurrentWeek(startDate, endDate);
-      _prefetchAdjacentWeeks(startDate, endDate);
-    });
-  }
-
-  void resetWeek() {
-    final reference = DateTime.now().addDays(2);
-    changeWeek(reference.mondayOfWeek, _endOfWeek(reference));
-  }
-
-  void refresh() => fetch();
-
   Future<void> addCustomEvent(CustomTimetableEvent event) async {
     await repo.data.addCustomEvent(event);
     await _refreshCustomEvents();
@@ -132,67 +91,10 @@ class TimetableBloc
   }
 
   Future<void> _refreshSubjects() async {
-    final subjects = await repo.data.getSubjects(renew: true);
+    final subjects = await repo.data.getSubjects();
     add(DataGathered((s) => s.withReferenceData(subjects: subjects)));
   }
 
-  Future<void> _loadCurrentWeek(
-    DateTime startDate,
-    DateTime endDate, {
-    void Function(Object)? onError,
-    bool renew = false,
-  }) async {
-    final requestStart = DateTime.now();
-    _lastWeekRequestStart = requestStart;
-    try {
-      final week = await repo.data.getWeek(
-        startDate,
-        endDate,
-        onError: onError,
-        renew: renew,
-      );
-      if (_lastWeekRequestStart.isAfter(requestStart)) return;
-      _writeWeekToCache(startDate, week);
-    } catch (e) {
-      log('getWeek error for $startDate–$endDate: $e');
-      onError?.call(e);
-    }
-  }
-
-  Future<void> _loadStaticReferenceData({
-    void Function(Object)? onError,
-    bool renew = false,
-  }) async {
-    try {
-      final (rooms, subjects, schoolHolidays, schoolyear) = await (
-        repo.data.getRooms(onError: onError, renew: renew),
-        repo.data.getSubjects(onError: onError, renew: renew),
-        repo.data.getSchoolHolidays(onError: onError, renew: renew),
-        repo.data.getCurrentSchoolyear(onError: onError, renew: renew),
-      ).wait;
-
-      add(
-        Emit(
-          (s) => s.withReferenceData(
-            rooms: rooms,
-            subjects: subjects,
-            schoolHolidays: schoolHolidays,
-            schoolyear: schoolyear,
-          ),
-        ),
-      );
-    } catch (e) {
-      onError?.call(e);
-    }
-
-    try {
-      final timegrid = await repo.data.getTimegrid(renew: renew);
-      add(Emit((s) => s.withReferenceData(timegrid: timegrid)));
-    } catch (_) {
-      // Timegrid load failure falls back to a hardcoded schedule in the UI layer.
-    }
-  }
-
   Future<void> _loadCustomEvents({
     void Function(Object)? onError,
     bool renew = false,
@@ -213,27 +115,4 @@ class TimetableBloc
     final events = await repo.data.getCustomEvents(renew: true);
     add(DataGathered((s) => s.withReferenceData(customEvents: events)));
   }
-
-  void _prefetchAdjacentWeeks(DateTime start, DateTime end) {
-    _prefetchWeek(start.subtractDays(7), end.subtractDays(7));
-    _prefetchWeek(start.addDays(7), end.addDays(7));
-  }
-
-  void _prefetchWeek(DateTime start, DateTime end) {
-    repo.data
-        .getWeek(start, end)
-        .then((week) => _writeWeekToCache(start, week))
-        .catchError((_) {});
-  }
-
-  void _writeWeekToCache(DateTime weekStart, TimetableGetWeekResponse week) {
-    add(Emit((s) => s.withFetchedWeek(weekStart, week)));
-  }
-
-  static DateTime _endOfWeek(DateTime reference) {
-    final friday = reference.addDays(
-      DateTime.daysPerWeek - reference.weekday - 2,
-    );
-    return DateTime(friday.year, friday.month, friday.day);
-  }
 }

lib/state/app/modules/timetable/bloc/timetable_state.dart

@@ -98,9 +98,9 @@ abstract class TimetableState with _$TimetableState {
     );
   }
 
-  bool get hasReferenceData =>
+  /// Everything a foreign plan needs to render; it never has custom events.
-      rooms != null &&
+  bool get hasSchoolReferenceData =>
-      subjects != null &&
+      rooms != null && subjects != null && schoolHolidays != null;
-      schoolHolidays != null &&
+
-      customEvents != null;
+  bool get hasReferenceData => hasSchoolReferenceData && customEvents != null;
 }

lib/state/app/modules/timetable/bloc/timetable_week_loader.dart

@@ -0,0 +1,138 @@
+import 'dart:developer';
+
+import '../../../../../api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
+import '../../../../../extensions/date_time.dart';
+import '../../../infrastructure/repository/repository.dart';
+import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
+import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
+import '../data_provider/timetable_data_provider.dart';
+import 'timetable_event.dart';
+import 'timetable_state.dart';
+
+/// The date whose week the timetable opens on — two days ahead, so Saturday
+/// and Sunday already show the next week.
+DateTime timetableAnchorDate() => DateTime.now().addDays(2);
+
+/// Monday 00:00 to Friday 00:00 of the week the timetable opens on.
+(DateTime, DateTime) currentTimetableWeek() {
+  final reference = timetableAnchorDate();
+  final friday = reference.addDays(
+    DateTime.daysPerWeek - reference.weekday - 2,
+  );
+  return (reference.mondayOfWeek, friday.dateOnly);
+}
+
+/// Week navigation, week loading/prefetching and the school-wide reference
+/// data, shared by the own and the foreign timetable.
+mixin TimetableWeekLoader<R extends Repository<TimetableState>>
+    on LoadableHydratedBloc<TimetableEvent, TimetableState, R> {
+  DateTime _lastWeekRequestStart = DateTime.fromMillisecondsSinceEpoch(0);
+
+  Future<TimetableGetWeekResponse> fetchWeek(DateTime start, DateTime end);
+
+  TimetableDataProvider get referenceData;
+
+  @override
+  TimetableState fromNothing() {
+    final (start, end) = currentTimetableWeek();
+    return TimetableState(startDate: start, endDate: end);
+  }
+
+  /// Loads the viewed week and the reference data (plus [also]), fails with
+  /// the first error of any of them and prefetches the neighbouring weeks.
+  Future<void> gatherWeek({
+    Future<void> Function(void Function(Object) onError)? also,
+  }) async {
+    final initial = innerState ?? fromNothing();
+
+    Object? firstError;
+    void recordError(Object e) => firstError ??= e;
+
+    await Future.wait([
+      _loadWeek(initial.startDate, initial.endDate, onError: recordError),
+      _loadReferenceData(onError: recordError),
+      if (also != null) also(recordError),
+    ]);
+
+    if (firstError != null) throw firstError!;
+
+    add(DataGathered((s) => s));
+    _prefetchAdjacentWeeks(initial.startDate, initial.endDate);
+  }
+
+  void changeWeek(DateTime startDate, DateTime endDate) {
+    final current = innerState ?? fromNothing();
+    if (current.startDate == startDate && current.endDate == endDate) return;
+    add(Emit((s) => s.copyWith(startDate: startDate, endDate: endDate)));
+    runInSession(() {
+      _loadWeek(startDate, endDate);
+      _prefetchAdjacentWeeks(startDate, endDate);
+    });
+  }
+
+  void refresh() => fetch();
+
+  Future<void> _loadWeek(
+    DateTime startDate,
+    DateTime endDate, {
+    void Function(Object)? onError,
+  }) async {
+    final requestStart = DateTime.now();
+    _lastWeekRequestStart = requestStart;
+    try {
+      final week = await fetchWeek(startDate, endDate);
+      if (_lastWeekRequestStart.isAfter(requestStart)) return;
+      _writeWeekToCache(startDate, week);
+    } catch (e) {
+      log('Week load error for $startDate–$endDate: $e');
+      onError?.call(e);
+    }
+  }
+
+  Future<void> _loadReferenceData({void Function(Object)? onError}) async {
+    try {
+      final (rooms, subjects, schoolHolidays, schoolyear) = await (
+        referenceData.getRooms(onError: onError),
+        referenceData.getSubjects(onError: onError),
+        referenceData.getSchoolHolidays(onError: onError),
+        referenceData.getCurrentSchoolyear(onError: onError),
+      ).wait;
+
+      add(
+        Emit(
+          (s) => s.withReferenceData(
+            rooms: rooms,
+            subjects: subjects,
+            schoolHolidays: schoolHolidays,
+            schoolyear: schoolyear,
+          ),
+        ),
+      );
+    } catch (e) {
+      onError?.call(e);
+    }
+
+    try {
+      final timegrid = await referenceData.getTimegrid();
+      add(Emit((s) => s.withReferenceData(timegrid: timegrid)));
+    } catch (_) {
+      // Timegrid load failure falls back to a hardcoded schedule in the UI.
+    }
+  }
+
+  void _prefetchAdjacentWeeks(DateTime start, DateTime end) {
+    _prefetchWeek(start.subtractDays(7), end.subtractDays(7));
+    _prefetchWeek(start.addDays(7), end.addDays(7));
+  }
+
+  void _prefetchWeek(DateTime start, DateTime end) {
+    fetchWeek(
+      start,
+      end,
+    ).then((week) => _writeWeekToCache(start, week)).catchError((_) {});
+  }
+
+  void _writeWeekToCache(DateTime weekStart, TimetableGetWeekResponse week) {
+    add(Emit((s) => s.withFetchedWeek(weekStart, week)));
+  }
+}

lib/state/app/modules/timetable/data_provider/timetable_data_provider.dart

@@ -23,72 +23,31 @@ import '../../../../../api/mhsl/custom_timetable_event/get/get_custom_timetable_
 import '../../../../../api/request_cache.dart';
 
 /// Pulls the timetable from the Marianum-Connect mobile API. Each endpoint is
-/// its own HTTP call; this provider exposes the lazy futures so the bloc can
+/// its own HTTP call; this provider exposes the futures so the bloc can chain
-/// chain them without seeing the dio layer.
+/// them without seeing the dio layer.
 class TimetableDataProvider {
   Future<TimetableGetWeekResponse> getWeek(
     DateTime startDate,
-    DateTime endDate, {
+    DateTime endDate,
-    void Function(Object)? onError,
+  ) async => TimetableGetWeek().run(from: startDate, until: endDate);
-    bool renew = false,
-  }) async {
-    try {
-      return await TimetableGetWeek().run(from: startDate, until: endDate);
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
 
   Future<TimetableGetRoomsResponse> getRooms({
     void Function(Object)? onError,
-    bool renew = false,
+  }) => _reportingErrors(TimetableGetRooms().run, onError);
-  }) async {
-    try {
-      return await TimetableGetRooms().run();
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
 
   Future<TimetableGetSubjectsResponse> getSubjects({
     void Function(Object)? onError,
-    bool renew = false,
+  }) => _reportingErrors(TimetableGetSubjects().run, onError);
-  }) async {
-    try {
-      return await TimetableGetSubjects().run();
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
 
   Future<TimetableGetHolidaysResponse> getSchoolHolidays({
     void Function(Object)? onError,
-    bool renew = false,
+  }) => _reportingErrors(TimetableGetHolidays().run, onError);
-  }) async {
-    try {
-      return await TimetableGetHolidays().run();
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
 
   Future<TimetableGetSchoolyearResponse> getCurrentSchoolyear({
     void Function(Object)? onError,
-    bool renew = false,
+  }) => _reportingErrors(TimetableGetSchoolyear().run, onError);
-  }) async {
-    try {
-      return await TimetableGetSchoolyear().run();
-    } catch (e) {
-      onError?.call(e);
-      rethrow;
-    }
-  }
 
-  Future<TimetableGetTimegridResponse> getTimegrid({bool renew = false}) =>
+  Future<TimetableGetTimegridResponse> getTimegrid() =>
       TimetableGetTimegrid().run();
 
   Future<GetCustomTimetableEventResponse> getCustomEvents({
@@ -131,4 +90,18 @@ class TimetableDataProvider {
     if (DemoMode.active) return Future.value();
     return TimetableSubjectColorRemove().run(subjectShort);
   }
+
+  // Reports the original error before rethrowing: callers await several of
+  // these together, and a parallel wait only surfaces a combined error.
+  static Future<T> _reportingErrors<T>(
+    Future<T> Function() request,
+    void Function(Object)? onError,
+  ) async {
+    try {
+      return await request();
+    } catch (e) {
+      onError?.call(e);
+      rethrow;
+    }
+  }
 }

lib/storage/dev_tools_settings.dart

@@ -88,14 +88,10 @@ class DevToolsSettings {
     if (trimmed.isEmpty) return null;
     final uri = Uri.tryParse(trimmed);
     if (uri == null || !uri.hasScheme) return null;
-    if (uri.scheme == 'https') {
+    final schemeAllowed =
-      // always fine
+        uri.scheme == 'https' ||
-    } else if (uri.scheme == 'http' && allowsHttpCustomEndpoint) {
+        (uri.scheme == 'http' && allowsHttpCustomEndpoint);
-      // dev only
+    if (!schemeAllowed || uri.host.isEmpty) return null;
-    } else {
-      return null;
-    }
-    if (uri.host.isEmpty) return null;
     return trimmed.endsWith('/')
         ? trimmed.substring(0, trimmed.length - 1)
         : trimmed;

lib/storage/modules_settings.dart

@@ -1,6 +1,6 @@
-import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:json_annotation/json_annotation.dart';
 
-import '../../state/app/modules/app_modules.dart';
+import '../state/app/modules/app_modules.dart';
 
 part 'modules_settings.g.dart';
 

lib/storage/timetable_favorites_settings.dart

@@ -34,8 +34,7 @@ class TimetableFavoritesSettings {
   /// Adds or removes the element in place. Returns the new favorite state
   /// (`true` = now starred). Callers persist via `SettingsCubit.val(write: true)`.
   bool toggle(TimetableElementType type, int id, String label) {
-    final existing = favorites.where((f) => f.type == type && f.id == id);
+    if (isFavorite(type, id)) {
-    if (existing.isNotEmpty) {
       favorites.removeWhere((f) => f.type == type && f.id == id);
       return false;
     }

lib/storage/timetable_settings.dart

@@ -1,6 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
 
-import '../../../view/pages/timetable/data/timetable_name_mode.dart';
+import '../view/pages/timetable/data/timetable_name_mode.dart';
 
 part 'timetable_settings.g.dart';
 

lib/theming/app_theme.dart

@@ -10,31 +10,21 @@ class AppSpacing {
   static const double xl = 40;
 }
 
-TextStyle inputErrorStyle(BuildContext context) =>
-    TextStyle(color: Theme.of(context).colorScheme.error);
-
 class AppTheme {
-  static DropdownDisplay getDisplayOptions(ThemeMode theme) {
+  static DropdownDisplay getDisplayOptions(ThemeMode theme) => switch (theme) {
-    switch (theme) {
+    ThemeMode.system => DropdownDisplay(
-      case ThemeMode.system:
-        return DropdownDisplay(
       icon: Icons.auto_fix_high_outlined,
       displayName: 'Systemvorgabe',
-        );
+    ),
-
+    ThemeMode.light => DropdownDisplay(
-      case ThemeMode.light:
-        return DropdownDisplay(
       icon: Icons.wb_sunny_outlined,
       displayName: 'Hell',
-        );
+    ),
-
+    ThemeMode.dark => DropdownDisplay(
-      case ThemeMode.dark:
-        return DropdownDisplay(
       icon: Icons.dark_mode_outlined,
       displayName: 'Dunkel',
-        );
+    ),
-    }
+  };
-  }
 
   static bool isDarkMode(BuildContext context) =>
       Theme.of(context).brightness == Brightness.dark;

lib/utils/downloads/download_job.dart

@@ -35,11 +35,7 @@ class DownloadFailed extends DownloadStatus {
 /// the same job. Kept engine-agnostic on purpose — the native
 /// `background_downloader` task lives entirely inside [DownloadManager].
 class DownloadJob {
-  DownloadJob({
+  DownloadJob({required this.remotePath, required this.name, this.remoteFile});
-    required this.remotePath,
-    required this.name,
-    this.remoteFile,
-  });
 
   final String remotePath;
   final String name;
@@ -59,10 +55,7 @@ class DownloadJob {
     const DownloadInProgress(0),
   );
 
-  bool get isFinished =>
+  bool get isFinished => status.value is! DownloadInProgress;
-      status.value is DownloadDone ||
-      status.value is DownloadFailed ||
-      status.value is DownloadCancelled;
 
   bool get isDone => status.value is DownloadDone;
   bool get isFailed => status.value is DownloadFailed;

lib/utils/downloads/download_manager.dart

@@ -237,9 +237,7 @@ class DownloadManager {
         // instead of freezing at the last percent.
         job.status.value = const DownloadCancelled();
       }
-      _jobs.remove(job.remotePath);
+      _forget(job);
-      if (taskId != null) _byTaskId.remove(taskId);
-      scheduleMicrotask(job.dispose);
     }
     _refreshVisible();
   }
@@ -330,10 +328,14 @@ class DownloadManager {
   // --- bookkeeping -----------------------------------------------------------
 
   void _remove(DownloadJob job) {
+    _forget(job);
+    _refreshVisible();
+  }
+
+  void _forget(DownloadJob job) {
     _jobs.remove(job.remotePath);
     final taskId = job.taskId;
     if (taskId != null) _byTaskId.remove(taskId);
-    _refreshVisible();
     scheduleMicrotask(job.dispose);
   }
 

lib/utils/file_clipboard.dart

@@ -21,16 +21,15 @@ class FileClipboard extends ChangeNotifier {
   List<CacheableFile> get files => List.unmodifiable(_files);
   bool get isEmpty => _files.isEmpty;
 
-  void cut(List<CacheableFile> files) {
+  void cut(List<CacheableFile> files) =>
-    if (files.isEmpty) return;
+      _set(FileClipboardOperation.cut, files);
-    _operation = FileClipboardOperation.cut;
-    _files = List.of(files);
-    notifyListeners();
-  }
 
-  void copy(List<CacheableFile> files) {
+  void copy(List<CacheableFile> files) =>
+      _set(FileClipboardOperation.copy, files);
+
+  void _set(FileClipboardOperation operation, List<CacheableFile> files) {
     if (files.isEmpty) return;
-    _operation = FileClipboardOperation.copy;
+    _operation = operation;
     _files = List.of(files);
     notifyListeners();
   }

lib/utils/random_id.dart

@@ -8,12 +8,3 @@ String randomHexId({int bytes = 16}) {
     (_) => random.nextInt(256),
   ).map((b) => b.toRadixString(16).padLeft(2, '0')).join();
 }
-
-/// Random RFC 4122 version-4 UUID, for ids a server expects in UUID form.
-String randomUuidV4() {
-  final hex = randomHexId();
-  final variant = (int.parse(hex[16], radix: 16) & 0x3 | 0x8).toRadixString(16);
-  return '${hex.substring(0, 8)}-${hex.substring(8, 12)}-'
-      '4${hex.substring(13, 16)}-$variant${hex.substring(17, 20)}-'
-      '${hex.substring(20)}';
-}

lib/view/login/widgets/login_card.dart

@@ -32,25 +32,14 @@ class _LoginCardState extends State<LoginCard> {
   final _passwordController = TextEditingController();
   final _passwordFocus = FocusNode();
 
-  @override
-  void initState() {
-    super.initState();
-    widget.controller.addListener(_onControllerChange);
-  }
-
   @override
   void dispose() {
-    widget.controller.removeListener(_onControllerChange);
     _usernameController.dispose();
     _passwordController.dispose();
     _passwordFocus.dispose();
     super.dispose();
   }
 
-  void _onControllerChange() {
-    if (mounted) setState(() {});
-  }
-
   String? _required(String? value) =>
       (value ?? '').trim().isEmpty ? 'Eingabe erforderlich' : null;
 
@@ -81,7 +70,10 @@ class _LoginCardState extends State<LoginCard> {
   }
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context) =>
+      ListenableBuilder(listenable: widget.controller, builder: _buildForm);
+
+  Widget _buildForm(BuildContext context, Widget? _) {
     final theme = Theme.of(context);
     final loading = widget.controller.loading;
     return Form(

lib/view/pages/absence_report/absence_report_view.dart

@@ -30,6 +30,12 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
   final TextEditingController _lastName = TextEditingController();
   final TextEditingController _phone = TextEditingController();
   final TextEditingController _note = TextEditingController();
+  late final List<TextEditingController> _textControllers = [
+    _firstName,
+    _lastName,
+    _phone,
+    _note,
+  ];
   final AsyncActionController _submitController = AsyncActionController();
 
   late Future<void> _init;
@@ -46,7 +52,7 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
     final today = DateUtils.dateOnly(DateTime.now());
     _absentFrom = today;
     _absentUntil = today;
-    for (final c in [_firstName, _lastName, _phone, _note]) {
+    for (final c in _textControllers) {
       c.addListener(_onFieldChanged);
     }
     _init = _load();
@@ -54,7 +60,7 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
 
   @override
   void dispose() {
-    for (final c in [_firstName, _lastName, _phone, _note]) {
+    for (final c in _textControllers) {
       c.dispose();
     }
     _submitController.dispose();
@@ -290,11 +296,9 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
   String? _requiredError(TextEditingController controller) =>
       _submitted && controller.text.trim().isEmpty ? _required : null;
 
-  InputDecoration _decoration(String label, {String? error, String? hint}) =>
+  InputDecoration _decoration(String label, {String? error}) => InputDecoration(
-      InputDecoration(
     border: const OutlineInputBorder(),
     labelText: label,
-        hintText: hint,
     errorText: error,
   );
 }

lib/view/pages/files/data/file_sort.dart

@@ -0,0 +1,25 @@
+import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
+import '../../../../api/marianumcloud/webdav/queries/list_files/list_files_response.dart';
+import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
+import 'sort_options.dart';
+
+typedef FileSort = ({SortOption by, bool ascending, bool foldersToTop});
+
+/// Selector for `context.select`, so folder views rebuild only when the
+/// file sort settings change.
+FileSort fileSortOf(SettingsCubit cubit) {
+  final settings = cubit.state.fileSettings;
+  return (
+    by: settings.sortBy,
+    ascending: settings.ascending,
+    foldersToTop: settings.sortFoldersToTop,
+  );
+}
+
+extension FileSortListing on ListFilesResponse {
+  List<CacheableFile> sortedBy(FileSort sort) => sortBy(
+    sortOption: sort.by,
+    foldersToTop: sort.foldersToTop,
+    reversed: sort.ascending,
+  );
+}

lib/view/pages/files/data/file_type_icon.dart

@@ -11,12 +11,7 @@ IconData iconForFile(CacheableFile file) {
     final byMime = _iconForMime(mime);
     if (byMime != null) return byMime;
   }
-  final ext = _extensionOf(file.name);
+  return iconForFileName(file.name);
-  if (ext != null) {
-    final byExt = _extensionIcons[ext];
-    if (byExt != null) return byExt;
-  }
-  return Icons.insert_drive_file_outlined;
 }
 
 /// Icon for a bare file name (no [CacheableFile] / MIME available), e.g. in the

lib/view/pages/files/data/webdav_path.dart

@@ -0,0 +1,26 @@
+// Paths relative to the WebDAV root, as used by `CacheableFile.path`: no
+// leading slash, folders end with '/', the root folder is ''.
+
+final RegExp _edgeSlashes = RegExp(r'^/+|/+$');
+
+List<String> webdavSegmentsOf(String path) {
+  final stripped = path.replaceAll(_edgeSlashes, '');
+  return stripped.isEmpty ? [] : stripped.split('/');
+}
+
+List<String> webdavParentSegmentsOf(String path) {
+  final segments = webdavSegmentsOf(path);
+  if (segments.isNotEmpty) segments.removeLast();
+  return segments;
+}
+
+String webdavFolderPath(List<String> segments) =>
+    segments.isEmpty ? '' : '${segments.join('/')}/';
+
+String webdavJoin(String folder, String name, {required bool isDirectory}) =>
+    isDirectory ? '$folder$name/' : '$folder$name';
+
+/// Folder key used by `ListFilesCache` and `FilesBloc`: no leading or
+/// trailing slash, root is '/'.
+String listFilesCacheKey(List<String> segments) =>
+    segments.isEmpty ? '/' : segments.join('/');

lib/view/pages/files/files.dart

@@ -11,10 +11,10 @@ import '../../../state/app/infrastructure/loadable_state/view/loadable_state_con
 import '../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../state/app/modules/files/bloc/files_bloc.dart';
 import '../../../state/app/modules/files/bloc/files_state.dart';
-import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../utils/cache_invalidation_bus.dart';
 import '../../../widget/placeholder_view.dart';
-import 'data/sort_options.dart';
+import 'data/file_sort.dart';
+import 'data/webdav_path.dart';
 import 'files_upload_dialog.dart';
 import 'search/files_search_delegate.dart';
 import 'widgets/add_file_menu.dart';
@@ -44,9 +44,6 @@ class _FilesView extends StatefulWidget {
 }
 
 class _FilesViewState extends State<_FilesView> {
-  late final SettingsCubit settings;
-  late SortOption currentSort;
-  late bool currentSortDirection;
   late final StreamSubscription<String> _invalidationSub;
 
   // The list builder also runs for loading flips and parent rebuilds; only a
@@ -54,32 +51,16 @@ class _FilesViewState extends State<_FilesView> {
   Object? _sortedKey;
   List<CacheableFile> _sortedFiles = const [];
 
-  List<CacheableFile> _sorted(ListFilesResponse listing, bool foldersToTop) {
+  List<CacheableFile> _sorted(ListFilesResponse listing, FileSort sort) {
-    final key = (listing, currentSort, currentSortDirection, foldersToTop);
+    final key = (listing, sort);
     if (key == _sortedKey) return _sortedFiles;
     _sortedKey = key;
-    return _sortedFiles = listing.sortBy(
+    return _sortedFiles = listing.sortedBy(sort);
-      sortOption: currentSort,
-      foldersToTop: foldersToTop,
-      reversed: currentSortDirection,
-    );
   }
 
-  // Cache key in FilesBloc's pathString format: '/' for root, otherwise
-  // segments joined without leading/trailing slash.
-  String get _myPathString => widget.path.isEmpty ? '/' : widget.path.join('/');
-
-  // Relative folder path matching the WebDAV format used by `CacheableFile.path`
-  // (no leading slash; trailing slash for non-root). Empty string means root.
-  String get _currentFolderPath =>
-      widget.path.isEmpty ? '' : '${widget.path.join('/')}/';
-
   @override
   void initState() {
     super.initState();
-    settings = context.read<SettingsCubit>();
-    currentSort = settings.val().fileSettings.sortBy;
-    currentSortDirection = settings.val().fileSettings.ascending;
     _invalidationSub = CacheInvalidationBus.listFilesStream.listen(
       _onInvalidation,
     );
@@ -87,7 +68,7 @@ class _FilesViewState extends State<_FilesView> {
 
   void _onInvalidation(String invalidatedPath) {
     if (!mounted) return;
-    if (invalidatedPath != _myPathString) return;
+    if (invalidatedPath != listFilesCacheKey(widget.path)) return;
     context.read<FilesBloc>().refresh();
   }
 
@@ -118,29 +99,12 @@ class _FilesViewState extends State<_FilesView> {
     final bloc = context.read<FilesBloc>();
     // Selected here, not in the LoadableStateConsumer child: that closure runs
     // during the consumer's build, where this context may not subscribe.
-    final foldersToTop = context.select(
+    final sort = context.select(fileSortOf);
-      (SettingsCubit c) => c.state.fileSettings.sortFoldersToTop,
-    );
     return Scaffold(
       appBar: AppBar(
         title: Text(widget.path.isNotEmpty ? widget.path.last : 'Dateien'),
         actions: [
-          FilesSortActions(
+          const FilesSortActions(),
-            currentSort: currentSort,
-            ascending: currentSortDirection,
-            onDirectionChanged: (e) {
-              setState(() {
-                currentSortDirection = e;
-                settings.val(write: true).fileSettings.ascending = e;
-              });
-            },
-            onSortChanged: (e) {
-              setState(() {
-                currentSort = e;
-                settings.val(write: true).fileSettings.sortBy = e;
-              });
-            },
-          ),
           IconButton(
             tooltip: 'Suchen',
             icon: const Icon(Icons.search),
@@ -162,7 +126,7 @@ class _FilesViewState extends State<_FilesView> {
       body: Column(
         children: [
           ClipboardBanner(
-            currentFolder: _currentFolderPath,
+            currentFolder: webdavFolderPath(widget.path),
             onPasteDone: bloc.refresh,
           ),
           Expanded(
@@ -176,7 +140,7 @@ class _FilesViewState extends State<_FilesView> {
                     text: 'Der Ordner ist leer',
                   );
                 }
-                final files = _sorted(listing, foldersToTop);
+                final files = _sorted(listing, sort);
                 return ListView.builder(
                   padding: EdgeInsets.zero,
                   itemCount: files.length,

lib/view/pages/files/files_upload_dialog.dart

@@ -28,13 +28,15 @@ class FilesUploadDialog extends StatefulWidget {
 }
 
 class UploadableFile {
-  TextEditingController fileNameController = TextEditingController();
+  final String filePath;
-  String filePath;
+  final TextEditingController fileNameController;
-  String fileName;
   double? _uploadProgress;
   bool isConflicting = false;
 
-  UploadableFile(this.filePath, this.fileName);
+  UploadableFile(this.filePath, String fileName)
+    : fileNameController = TextEditingController(text: fileName);
+
+  String get fileName => fileNameController.text;
 }
 
 class _FilesUploadDialogState extends State<FilesUploadDialog> {
@@ -47,10 +49,22 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
   void initState() {
     super.initState();
 
-    _uploadableFiles = widget.filePaths.map((filePath) {
+    _uploadableFiles = widget.filePaths
-      var fileName = filePath.split(Platform.pathSeparator).last;
+        .map(
-      return UploadableFile(filePath, fileName);
+          (filePath) => UploadableFile(
-    }).toList();
+            filePath,
+            filePath.split(Platform.pathSeparator).last,
+          ),
+        )
+        .toList();
+  }
+
+  @override
+  void dispose() {
+    for (final file in _uploadableFiles) {
+      file.fileNameController.dispose();
+    }
+    super.dispose();
   }
 
   void _resetProgress() {
@@ -69,6 +83,10 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
     );
   }
 
+  void _clearConflict(UploadableFile file) {
+    if (file.isConflicting) setState(() => file.isConflicting = false);
+  }
+
   Future<void> uploadFiles({bool override = false}) async {
     setState(() {
       _isUploading = true;
@@ -82,36 +100,39 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
     if (!mounted) return;
 
     if (!override) {
-      List<dynamic> result;
+      final List<String> existingPaths;
       try {
-        result = (await webdavClient.propfind(
+        final result = await webdavClient.propfind(
           PathUri.parse(widget.remotePath),
-        )).responses;
+        );
+        existingPaths = [
+          for (final response in result.responses)
+            Uri.decodeComponent(response.href!),
+        ];
       } catch (e) {
         if (!mounted) return;
         _showUploadError('Verbindung fehlgeschlagen: $e');
         return;
       }
-      final conflictingFiles = _uploadableFiles.where((file) {
+      final conflictingFiles = _uploadableFiles
-        final fileName = file.fileName;
+          .where(
-        return result.any(
+            (file) => existingPaths.any(
-          (element) => Uri.decodeComponent(
+              (path) => path.endsWith('/${file.fileName}'),
-            (element as WebDavResponse).href!,
+            ),
-          ).endsWith('/$fileName'),
+          )
-        );
+          .toList();
-      }).toList();
 
       if (conflictingFiles.isNotEmpty) {
         if (!mounted) return;
         final replaceFiles = await showDialog<bool>(
           context: context,
           barrierDismissible: false,
-          builder: (context) => AlertDialog(
+          builder: (dialogContext) => AlertDialog(
             contentPadding: const EdgeInsets.all(10),
             title: const Text('Konflikt', textAlign: TextAlign.center),
             content: conflictingFiles.length == 1
                 ? Text(
-                    'Eine Datei mit dem Namen "${conflictingFiles.map((e) => e.fileName).first}" existiert bereits.',
+                    'Eine Datei mit dem Namen "${conflictingFiles.first.fileName}" existiert bereits.',
                     textAlign: TextAlign.left,
                   )
                 : SingleChildScrollView(
@@ -122,27 +143,20 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
                   ),
             actions: [
               TextButton(
-                onPressed: () {
+                onPressed: () => Navigator.pop(dialogContext, false),
-                  Navigator.pop(context, false);
-                },
                 child: const Text('Bearbeiten', textAlign: TextAlign.center),
               ),
               TextButton(
-                onPressed: () {
+                // ConfirmDialog closes itself first, so this pop closes the
-                  showDialog(
+                // conflict dialog.
-                    context: context,
+                onPressed: () => ConfirmDialog(
-                    builder: (context) => ConfirmDialog(
                   title: 'Bestätigen?',
                   content:
                       'Bist du sicher, dass du ${conflictingFiles.length} Dateien überschreiben möchtest?',
-                      onConfirm: () {
+                  onConfirm: () => Navigator.pop(dialogContext, true),
-                        Navigator.pop(context, true);
-                      },
                   confirmButton: 'Ja',
                   cancelButton: 'Nein',
-                    ),
+                ).asDialog(dialogContext),
-                  );
-                },
                 child: const Text('Überschreiben', textAlign: TextAlign.center),
               ),
             ],
@@ -163,9 +177,9 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
     }
 
     var uploadetFilePaths = <String>[];
-    for (var file in _uploadableFiles) {
+    for (final (fileIndex, file) in _uploadableFiles.indexed) {
       var fileName = file.fileName;
-      var filePath = file.filePath;
+      final filePath = file.filePath;
 
       if (widget.uniqueNames) {
         final unique = DateTime.now().microsecondsSinceEpoch.toRadixString(36);
@@ -177,7 +191,7 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
 
       setState(() {
         _infoText =
-            '${_uploadableFiles.indexOf(file) + 1}/${_uploadableFiles.length}';
+            '${fileIndex + 1}/${_uploadableFiles.length}';
       });
 
       // A vanished source file would otherwise surface as a cryptic
@@ -193,7 +207,6 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
       }
 
       final HttpClientResponse uploadTask;
-      final fileIndex = _uploadableFiles.indexOf(file);
       var lastPercent = -1;
       try {
         uploadTask = await webdavClient.putFile(
@@ -253,12 +266,6 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
               itemCount: _uploadableFiles.length,
               itemBuilder: (context, index) {
                 final currentFile = _uploadableFiles[index];
-                // Only sync when it differs: assigning text resets selection
-                // and notifies the field on every (progress) rebuild.
-                if (currentFile.fileNameController.text !=
-                    currentFile.fileName) {
-                  currentFile.fileNameController.text = currentFile.fileName;
-                }
                 return ListTile(
                   title: TextField(
                     readOnly: _isUploading,
@@ -273,24 +280,11 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
                         color: Theme.of(context).colorScheme.error,
                       ),
                     ),
-                    onChanged: (input) {
-                      currentFile.fileName = input;
-                    },
                     onTapOutside: (PointerDownEvent event) {
                       FocusBehaviour.textFieldTapOutside(context);
-                      if (currentFile.isConflicting) {
+                      _clearConflict(currentFile);
-                        setState(() {
-                          currentFile.isConflicting = false;
-                        });
-                      }
-                    },
-                    onEditingComplete: () {
-                      if (currentFile.isConflicting) {
-                        setState(() {
-                          currentFile.isConflicting = false;
-                        });
-                      }
                     },
+                    onEditingComplete: () => _clearConflict(currentFile),
                   ),
                   subtitle:
                       _isUploading && (currentFile._uploadProgress ?? 0) < 1
@@ -301,21 +295,23 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
                           ),
                         )
                       : null,
-                  trailing: Container(
+                  trailing: SizedBox(
                     width: 24,
                     height: 24,
-                    padding: EdgeInsets.zero,
                     child: IconButton(
                       tooltip: 'Datei entfernen',
                       padding: EdgeInsets.zero,
                       onPressed: () {
                         if (!_isUploading) {
-                          if (_uploadableFiles.length - 1 <= 0) {
+                          if (_uploadableFiles.length == 1) {
                             Navigator.of(context).pop();
                           }
-                          setState(() {
+                          final removed = _uploadableFiles[index];
-                            _uploadableFiles.removeAt(index);
+                          setState(() => _uploadableFiles.removeAt(index));
-                          });
+                          // Its TextField is still mounted until the rebuild.
+                          WidgetsBinding.instance.addPostFrameCallback(
+                            (_) => removed.fileNameController.dispose(),
+                          );
                         }
                       },
                       icon: const Icon(Icons.delete_outlined),
@@ -342,7 +338,7 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
                     child: const Text('Abbrechen'),
                   ),
                 ),
-                const Expanded(child: SizedBox.shrink()),
+                const Spacer(),
                 Visibility(
                   visible: _isUploading,
                   replacement: TextButton(

lib/view/pages/files/search/files_search_controller.dart

@@ -3,6 +3,7 @@ import 'package:flutter/foundation.dart';
 import '../../../../api/marianumcloud/search/search_files.dart';
 import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
 import '../../../../utils/debouncer.dart';
+import '../data/webdav_path.dart';
 import 'local_cache_search.dart';
 
 /// Holds the live state of a Files-search session: current query, the latest
@@ -28,11 +29,10 @@ class FilesSearchController extends ChangeNotifier {
   bool _disposed = false;
   Future<List<CacheableFile>>? _localIndex;
 
-  Future<List<CacheableFile>> _searchLocal(List<String> pathScope) async =>
+  Future<List<CacheableFile>> _searchLocal() async => searchLocalCacheIndex(
-      searchLocalCacheIndex(
     await (_localIndex ??= loadLocalCacheIndex()),
     _query,
-        pathScope: pathScope,
+    pathScope: _pathScope,
   );
 
   /// Guards against the race where the search delegate is closed (and the
@@ -45,10 +45,7 @@ class FilesSearchController extends ChangeNotifier {
   }
 
   String get query => _query;
-  List<String> get pathScope => List.unmodifiable(_pathScope);
   bool get isScoped => _pathScope.isNotEmpty;
-  List<CacheableFile> get cacheResults => _cacheResults;
-  List<CacheableFile> get serverResults => _serverResults;
   bool get serverLoading => _serverLoading;
   Object? get serverError => _serverError;
 
@@ -81,18 +78,7 @@ class FilesSearchController extends ChangeNotifier {
       _safeNotify();
       return;
     }
-    // Show loading immediately — even before the (typically fast) cache
+    await _searchLocalThenServer(epoch);
-    // scan resolves — so the indicator is visible the moment the user
-    // starts typing rather than after the first await hop.
-    _serverLoading = true;
-    _serverError = null;
-    _safeNotify();
-
-    final cacheHits = await _searchLocal(_pathScope);
-    if (epoch != _serverEpoch) return;
-    _cacheResults = cacheHits;
-    _safeNotify();
-    _scheduleServerCall();
   }
 
   /// Drops the path filter and re-runs the current search globally. Used by
@@ -105,11 +91,18 @@ class FilesSearchController extends ChangeNotifier {
       _safeNotify();
       return;
     }
+    await _searchLocalThenServer(epoch);
+  }
+
+  Future<void> _searchLocalThenServer(int epoch) async {
+    // Show loading immediately — even before the (typically fast) cache
+    // scan resolves — so the indicator is visible the moment the user
+    // starts typing rather than after the first await hop.
     _serverLoading = true;
     _serverError = null;
     _safeNotify();
 
-    final cacheHits = await _searchLocal(const []);
+    final cacheHits = await _searchLocal();
     if (epoch != _serverEpoch) return;
     _cacheResults = cacheHits;
     _safeNotify();
@@ -135,7 +128,7 @@ class FilesSearchController extends ChangeNotifier {
   Future<void> _runServerCall() async {
     final epoch = _serverEpoch;
     final term = _query;
-    final scopePrefix = _pathScope.isEmpty ? '' : '${_pathScope.join('/')}/';
+    final scopePrefix = webdavFolderPath(_pathScope);
     try {
       final response = await _api.run(term: term);
       if (epoch != _serverEpoch) return;

lib/view/pages/files/search/files_search_delegate.dart

@@ -38,13 +38,7 @@ class FilesSearchDelegate extends SearchDelegate<void> {
   );
 
   @override
-  Widget buildResults(BuildContext context) {
+  Widget buildResults(BuildContext context) => buildSuggestions(context);
-    _controller.setQuery(query);
-    return FilesSearchResults(
-      controller: _controller,
-      onResultTap: () => close(context, null),
-    );
-  }
 
   @override
   Widget buildSuggestions(BuildContext context) {

lib/view/pages/files/search/files_search_results.dart

@@ -11,6 +11,7 @@ import '../../../../state/app/infrastructure/loadable_state/view/loadable_state_
 import '../../../../state/app/infrastructure/loadable_state/view/loadable_state_primary_loading.dart';
 import '../../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../../widget/placeholder_view.dart';
+import '../data/webdav_path.dart';
 import '../widgets/file_element.dart';
 import 'files_search_controller.dart';
 
@@ -80,8 +81,8 @@ class FilesSearchResults extends StatelessWidget {
                 visible: showErrorScreen,
                 message: errorMessage,
               ),
-              if (showEmpty) _emptyState(context),
+              if (showEmpty) _emptyState(),
-              if (hasContent) _resultList(context, combined),
+              if (hasContent) _resultList(combined),
             ],
           ),
         ),
@@ -89,7 +90,7 @@ class FilesSearchResults extends StatelessWidget {
     );
   }
 
-  Widget _emptyState(BuildContext context) => PlaceholderView(
+  Widget _emptyState() => PlaceholderView(
     icon: Icons.search_off_outlined,
     text: 'Keine Treffer gefunden.',
     button: controller.isScoped
@@ -101,7 +102,7 @@ class FilesSearchResults extends StatelessWidget {
         : null,
   );
 
-  Widget _resultList(BuildContext context, List<CacheableFile> combined) {
+  Widget _resultList(List<CacheableFile> combined) {
     final groups = _groupByParent(combined);
     final orderedKeys = groups.keys.toList()..sort();
     // Flat (folder header | file) rows built lazily: results can run into
@@ -117,7 +118,7 @@ class FilesSearchResults extends StatelessWidget {
       itemCount: rows.length,
       itemBuilder: (context, index) {
         final (folder, file) = rows[index];
-        final segments = _segmentsOf(folder);
+        final segments = webdavSegmentsOf(folder);
         if (file == null) {
           return _FolderHeader(
             key: ValueKey('folder:$folder'),
@@ -139,29 +140,14 @@ class FilesSearchResults extends StatelessWidget {
     );
   }
 
-  static final RegExp _edgeSlashes = RegExp(r'^/+|/+$');
-
   Map<String, List<CacheableFile>> _groupByParent(List<CacheableFile> files) {
     final map = <String, List<CacheableFile>>{};
     for (final file in files) {
-      map.putIfAbsent(_parentOf(file), () => []).add(file);
+      final parent = '/${webdavParentSegmentsOf(file.path).join('/')}';
+      map.putIfAbsent(parent, () => []).add(file);
     }
     return map;
   }
-
-  String _parentOf(CacheableFile file) {
-    final stripped = file.path.replaceAll(_edgeSlashes, '');
-    final segments = stripped.split('/');
-    if (segments.length <= 1) return '/';
-    segments.removeLast();
-    return '/${segments.join('/')}';
-  }
-
-  List<String> _segmentsOf(String folder) {
-    final stripped = folder.replaceAll(_edgeSlashes, '');
-    if (stripped.isEmpty) return const [];
-    return stripped.split('/');
-  }
 }
 
 class _FolderHeader extends StatelessWidget {

lib/view/pages/files/search/local_cache_search.dart

@@ -5,6 +5,7 @@ import 'package:flutter/foundation.dart';
 import '../../../../api/cache_store.dart';
 import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
 import '../../../../api/marianumcloud/webdav/queries/list_files/list_files_response.dart';
+import '../data/webdav_path.dart';
 
 /// Document key prefix used by `ListFilesCache._documentId`.
 const String _folderCachePrefix = 'wd-folder-';
@@ -42,18 +43,16 @@ List<CacheableFile> buildLocalCacheIndex(List<String> payloads) {
 /// Files in [index] whose name contains [query] (case-insensitive).
 ///
 /// [pathScope] restricts results to entries whose WebDAV path starts with
-/// the given folder. Pass an empty list (or null) to search globally.
+/// the given folder. Pass an empty list to search globally.
 List<CacheableFile> searchLocalCacheIndex(
   List<CacheableFile> index,
   String query, {
-  List<String>? pathScope,
+  List<String> pathScope = const [],
 }) {
   final trimmed = query.trim();
   if (trimmed.isEmpty) return const [];
   final needle = trimmed.toLowerCase();
-  final scopePrefix = pathScope == null || pathScope.isEmpty
+  final scopePrefix = webdavFolderPath(pathScope);
-      ? ''
-      : '${pathScope.join('/')}/';
   return [
     for (final file in index)
       if (file.lowerName.contains(needle) &&

lib/view/pages/files/sharing/share_options_sheet.dart

@@ -21,6 +21,18 @@ import 'share_password_sheet.dart';
 String _two(int n) => n.toString().padLeft(2, '0');
 String _isoDate(DateTime d) => '${d.year}-${_two(d.month)}-${_two(d.day)}';
 
+/// Token of the Talk room a share points to; null for other share kinds.
+String? talkRoomTokenOf(Share share) {
+  final token = share.shareWith;
+  return share.isRoom && token != null && token.isNotEmpty ? token : null;
+}
+
+/// Opens the Talk room and closes the sheet it was opened from.
+void openShareInTalk(BuildContext context, String token) {
+  AppRoutes.openChatByToken(context, token);
+  if (Navigator.of(context).canPop()) Navigator.of(context).pop();
+}
+
 IconData shareIcon(Share share) {
   if (share.isPublicLink) return Icons.link;
   if (share.isGroup) return Icons.groups_outlined;
@@ -85,6 +97,9 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
     }
   }
 
+  Future<void> _update(ShareUpdateParams params) =>
+      _mutate(() => FileSharingApi().update(_share.id, params));
+
   List<SharePreset> _availablePresets() => [
     SharePreset.readOnly,
     SharePreset.edit,
@@ -93,9 +108,7 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
 
   Future<void> _setPreset(SharePreset preset) async {
     final caps = context.read<NextcloudCapabilitiesCubit>();
-    await _mutate(
+    await _update(
-      () => FileSharingApi().update(
-        _share.id,
       ShareUpdateParams(
         permissions: permissionsFor(
           preset,
@@ -103,7 +116,6 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
           isFolder: _share.isFolder,
         ),
       ),
-      ),
     );
   }
 
@@ -121,20 +133,11 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
       lastDate: lastDate,
     );
     if (picked == null) return;
-    await _mutate(
+    await _update(ShareUpdateParams(expireDate: _isoDate(picked)));
-      () => FileSharingApi().update(
-        _share.id,
-        ShareUpdateParams(expireDate: _isoDate(picked)),
-      ),
-    );
   }
 
-  Future<void> _clearExpiry() => _mutate(
+  Future<void> _clearExpiry() =>
-    () => FileSharingApi().update(
+      _update(const ShareUpdateParams(expireDate: ''));
-      _share.id,
-      const ShareUpdateParams(expireDate: ''),
-    ),
-  );
 
   Future<void> _changePassword() async {
     final caps = context.read<NextcloudCapabilitiesCubit>();
@@ -144,27 +147,11 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
       policyHint: caps.passwordPolicyHint,
     );
     if (value == null || value.isEmpty || !mounted) return;
-    await _mutate(
+    await _update(ShareUpdateParams(password: value));
-      () => FileSharingApi().update(
-        _share.id,
-        ShareUpdateParams(password: value),
-      ),
-    );
   }
 
-  Future<void> _clearPassword() => _mutate(
+  Future<void> _clearPassword() =>
-    () => FileSharingApi().update(
+      _update(const ShareUpdateParams(password: ''));
-      _share.id,
-      const ShareUpdateParams(password: ''),
-    ),
-  );
-
-  void _openInTalk() {
-    final token = _share.shareWith;
-    if (token == null || token.isEmpty) return;
-    AppRoutes.openChatByToken(context, token);
-    if (Navigator.of(context).canPop()) Navigator.of(context).pop();
-  }
 
   Future<void> _confirmDelete() async {
     // Use showDialog directly (not asDialog) so we get the AsyncDialogAction's
@@ -217,12 +204,12 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
           ),
         ),
 
-        if (_share.isRoom && (_share.shareWith?.isNotEmpty ?? false)) ...[
+        if (talkRoomTokenOf(_share) case final token?) ...[
           const Divider(height: 24),
           ListTile(
             leading: const CenteredLeading(Icon(Icons.chat_bubble_outline)),
             title: const Text('Im Talk-Chat öffnen'),
-            onTap: _busy ? null : _openInTalk,
+            onTap: _busy ? null : () => openShareInTalk(context, token),
           ),
         ],
 

lib/view/pages/files/sharing/share_sheet.dart

@@ -47,19 +47,13 @@ class _ShareSheetBody extends StatefulWidget {
 
 class _ShareSheetBodyState extends State<_ShareSheetBody> {
   late final String _ocsPath = ocsPathOf(widget.file);
-  Future<List<Share>>? _future;
+  late Future<List<Share>> _future = FileSharingApi().listForPath(_ocsPath);
   bool _busy = false;
 
   /// Last resolved share list — used by the create-link gate without depending
   /// on the FutureBuilder's snapshot.
   List<Share>? _lastShares;
 
-  @override
-  void initState() {
-    super.initState();
-    _future = FileSharingApi().listForPath(_ocsPath);
-  }
-
   void _reload() {
     // Block body: an arrow would return the Future, which setState rejects.
     setState(() {
@@ -144,26 +138,19 @@ class _ShareSheetBodyState extends State<_ShareSheetBody> {
             leading: const CenteredLeading(Icon(Icons.person_add_outlined)),
             title: const Text('Person oder Gruppe hinzufügen'),
             enabled: !_busy,
-            onTap: _busy ? null : _addSharee,
+            onTap: _addSharee,
           ),
         if (caps.canCreatePublicLinks && _canAddLink(caps))
           ListTile(
             leading: const CenteredLeading(Icon(Icons.add_link)),
             title: const Text('Öffentlichen Link erstellen'),
             enabled: !_busy,
-            onTap: _busy ? null : _createPublicLink,
+            onTap: _createPublicLink,
           ),
       ],
     );
   }
 
-  void _openInTalk(Share share) {
-    final token = share.shareWith;
-    if (token == null || token.isEmpty) return;
-    AppRoutes.openChatByToken(context, token);
-    if (Navigator.of(context).canPop()) Navigator.of(context).pop();
-  }
-
   /// Whether another public link may be created — hidden once one exists on a
   /// server that disallows multiple links.
   bool _canAddLink(NextcloudCapabilitiesCubit caps) {
@@ -271,11 +258,11 @@ class _ShareSheetBodyState extends State<_ShareSheetBody> {
               tooltip: 'Link kopieren',
               onPressed: () => copyToClipboard(context, share.url!),
             ),
-          if (share.isRoom && (share.shareWith?.isNotEmpty ?? false))
+          if (talkRoomTokenOf(share) case final token?)
             IconButton(
               icon: const Icon(Icons.chat_bubble_outline),
               tooltip: 'Im Talk-Chat öffnen',
-              onPressed: () => _openInTalk(share),
+              onPressed: () => openShareInTalk(context, token),
             ),
           IconButton(
             icon: const Icon(Icons.settings_outlined),

lib/view/pages/files/widgets/clipboard_banner.dart

@@ -5,6 +5,7 @@ import '../../../../api/marianumcloud/webdav/queries/list_files/list_files_cache
 import '../../../../api/marianumcloud/webdav/webdav_api.dart';
 import '../../../../utils/file_clipboard.dart';
 import '../../../../widget/info_dialog.dart';
+import '../data/webdav_path.dart';
 
 /// Banner that appears at the top of a Files folder while there is something
 /// in the file clipboard. Shows the cut/copy state and offers a "Hier
@@ -26,16 +27,6 @@ class ClipboardBanner extends StatefulWidget {
 class _ClipboardBannerState extends State<ClipboardBanner> {
   bool _busy = false;
 
-  // All paths here are relative to the WebDAV root (matching `CacheableFile.path`).
-  // Root is the empty string ''. Folders end with '/'.
-  String _normalised(String path) {
-    final stripped = path.replaceAll(RegExp(r'^/+|/+$'), '');
-    return stripped.isEmpty ? '' : '$stripped/';
-  }
-
-  String _joinPath(String folder, String name, {required bool isDirectory}) =>
-      isDirectory ? '$folder$name/' : '$folder$name';
-
   // Disabled when:
   // - clipboard is empty
   // - we'd be pasting a folder into itself or one of its descendants
@@ -43,14 +34,14 @@ class _ClipboardBannerState extends State<ClipboardBanner> {
   bool get _canPaste {
     final cb = FileClipboard.instance;
     if (cb.isEmpty) return false;
-    final dst = _normalised(widget.currentFolder);
+    final dst = webdavFolderPath(webdavSegmentsOf(widget.currentFolder));
     var atLeastOneActionable = false;
     for (final f in cb.files) {
       if (f.isDirectory) {
-        final src = _normalised(f.path);
+        final src = webdavFolderPath(webdavSegmentsOf(f.path));
         if (dst == src || dst.startsWith(src)) return false;
       }
-      final destination = _joinPath(
+      final destination = webdavJoin(
         widget.currentFolder,
         f.name,
         isDirectory: f.isDirectory,
@@ -60,15 +51,6 @@ class _ClipboardBannerState extends State<ClipboardBanner> {
     return atLeastOneActionable;
   }
 
-  // Cache key format used by ListFilesCache (matches FilesBloc's pathString:
-  // relative, no leading or trailing slash; root is '/').
-  String _parentCacheKey(String relativePath) {
-    final stripped = relativePath.replaceAll(RegExp(r'^/+|/+$'), '');
-    if (!stripped.contains('/')) return '/';
-    final parts = stripped.split('/')..removeLast();
-    return parts.isEmpty ? '/' : parts.join('/');
-  }
-
   Future<void> _paste() async {
     final cb = FileClipboard.instance;
     if (_busy || !_canPaste) return;
@@ -79,7 +61,7 @@ class _ClipboardBannerState extends State<ClipboardBanner> {
     try {
       final webdav = await WebdavApi.webdav;
       for (final file in cb.files) {
-        final destination = _joinPath(
+        final destination = webdavJoin(
           widget.currentFolder,
           file.name,
           isDirectory: file.isDirectory,
@@ -91,7 +73,9 @@ class _ClipboardBannerState extends State<ClipboardBanner> {
               PathUri.parse(file.path),
               PathUri.parse(destination),
             );
-            invalidatedSourceFolders.add(_parentCacheKey(file.path));
+            invalidatedSourceFolders.add(
+              listFilesCacheKey(webdavParentSegmentsOf(file.path)),
+            );
           } else {
             await webdav.copy(
               PathUri.parse(file.path),
@@ -105,9 +89,9 @@ class _ClipboardBannerState extends State<ClipboardBanner> {
       // After cut, the source folders no longer contain the moved files. Drop
       // their cached listings so the next visit fetches fresh data instead of
       // briefly showing the moved file as still present.
-      for (final folder in invalidatedSourceFolders) {
+      await Future.wait(
-        await ListFilesCache.invalidate(folder);
+        invalidatedSourceFolders.map(ListFilesCache.invalidate),
-      }
+      );
       if (operation == FileClipboardOperation.cut) cb.clear();
       widget.onPasteDone();
     } finally {

lib/view/pages/files/widgets/file_element.dart

@@ -19,6 +19,7 @@ import '../../../../widget/details_bottom_sheet.dart';
 import '../../../../widget/downloads/download_trigger.dart';
 import '../../../../widget/prompt_dialog.dart';
 import '../../talk/widgets/highlighted_linkify.dart';
+import '../data/webdav_path.dart';
 import '../sharing/share_sheet.dart';
 import 'file_details_sheet.dart';
 import 'file_leading.dart';
@@ -26,7 +27,7 @@ import 'file_leading.dart';
 class FileElement extends StatefulWidget {
   final CacheableFile file;
   final List<String> path;
-  final void Function() refetch;
+  final VoidCallback refetch;
 
   /// When non-null, occurrences of this string in the file name are visually
   /// highlighted in the tile title. Used by the Files search delegate.
@@ -101,7 +102,7 @@ class _FileElementState extends State<FileElement>
     if (widget.file.isDirectory) {
       AppRoutes.openFolder(
         context,
-        widget.path.toList()..add(widget.file.name),
+        [...widget.path, widget.file.name],
       );
       return;
     }
@@ -116,18 +117,6 @@ class _FileElementState extends State<FileElement>
     );
   }
 
-  // All paths here are relative to the WebDAV root (matching CacheableFile.path).
-  // Root parent is the empty string ''. Folders end with '/'.
-  String _parentPathOf(String path) {
-    final stripped = path.replaceAll(RegExp(r'^/+|/+$'), '');
-    if (!stripped.contains('/')) return '';
-    final parts = stripped.split('/')..removeLast();
-    return parts.isEmpty ? '' : '${parts.join('/')}/';
-  }
-
-  String _joinPath(String folder, String name, {required bool isDirectory}) =>
-      isDirectory ? '$folder$name/' : '$folder$name';
-
   void _rename() {
     if (guardDemoAction(context)) return;
     showPromptDialog(
@@ -138,9 +127,8 @@ class _FileElementState extends State<FileElement>
       initialValue: widget.file.name,
       onConfirm: (newName) async {
         if (newName.isEmpty || newName == widget.file.name) return;
-        final parent = _parentPathOf(widget.file.path);
+        final destination = webdavJoin(
-        final destination = _joinPath(
+          webdavFolderPath(webdavParentSegmentsOf(widget.file.path)),
-          parent,
           newName,
           isDirectory: widget.file.isDirectory,
         );

lib/view/pages/files/widgets/files_sort_actions.dart

@@ -1,24 +1,22 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
+import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../data/sort_options.dart';
 
+/// Sort direction and sort key pickers, read from and persisted to the file
+/// settings.
 class FilesSortActions extends StatelessWidget {
-  final SortOption currentSort;
+  const FilesSortActions({super.key});
-  final bool ascending;
-  final ValueChanged<bool> onDirectionChanged;
-  final ValueChanged<SortOption> onSortChanged;
-
-  const FilesSortActions({
-    required this.currentSort,
-    required this.ascending,
-    required this.onDirectionChanged,
-    required this.onSortChanged,
-    super.key,
-  });
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
+    final settings = context.read<SettingsCubit>();
+    final (currentSort, ascending) = context.select(
+      (SettingsCubit c) =>
+          (c.state.fileSettings.sortBy, c.state.fileSettings.ascending),
+    );
     return Row(
       mainAxisSize: MainAxisSize.min,
       children: [
@@ -46,7 +44,7 @@ class FilesSortActions extends StatelessWidget {
                 ),
               )
               .toList(),
-          onSelected: onDirectionChanged,
+          onSelected: (e) => settings.val(write: true).fileSettings.ascending = e,
         ),
         PopupMenuButton<SortOption>(
           tooltip:
@@ -70,7 +68,7 @@ class FilesSortActions extends StatelessWidget {
                 ),
               )
               .toList(),
-          onSelected: onSortChanged,
+          onSelected: (e) => settings.val(write: true).fileSettings.sortBy = e,
         ),
       ],
     );

lib/view/pages/foreign_timetable/element_picker_page.dart

@@ -12,6 +12,7 @@ import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../storage/timetable_favorites_settings.dart';
 import '../../../utils/haptics.dart';
 import '../../../widget/app_progress_indicator.dart';
+import 'element_type_icon.dart';
 
 /// Full-screen picker: choose an element type (or "Alle" to search across all
 /// types), filter the (potentially large) list client-side, and pick an element
@@ -221,7 +222,7 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
     return Padding(
       padding: const EdgeInsets.only(right: 8),
       child: ChoiceChip(
-        avatar: Icon(type == null ? Icons.apps : _iconFor(type), size: 18),
+        avatar: Icon(type == null ? Icons.apps : type.icon, size: 18),
         showCheckmark: false,
         label: Text(type?.label ?? 'Alle'),
         selected: _selectedType == type,
@@ -293,7 +294,7 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
               }
             }
             final item = filtered[index - headerCount];
-            return _itemTile(item);
+            return _itemTile(item, favorites);
           },
         );
       },
@@ -316,7 +317,7 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
 
   Widget _favoriteTile(FavoriteTimetableElement favorite) {
     return ListTile(
-      leading: Icon(_iconFor(favorite.type)),
+      leading: Icon(favorite.type.icon),
       title: Text(favorite.label),
       subtitle: Text(favorite.type.label),
       trailing: IconButton(
@@ -329,12 +330,10 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
     );
   }
 
-  Widget _itemTile(_PickerItem item) {
+  Widget _itemTile(_PickerItem item, List<FavoriteTimetableElement> favorites) {
-    final isFavorite = context
+    final isFavorite = favorites.any(
-        .watch<SettingsCubit>()
+      (f) => f.type == item.type && f.id == item.id,
-        .val()
+    );
-        .timetableFavoritesSettings
-        .isFavorite(item.type, item.id);
 
     // In the "Alle" tab the type is otherwise ambiguous, so surface it.
     final subtitleParts = <String>[
@@ -344,7 +343,7 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
     ];
 
     return ListTile(
-      leading: Icon(_iconFor(item.type)),
+      leading: Icon(item.type.icon),
       title: Text(item.primary),
       subtitle: subtitleParts.isEmpty ? null : Text(subtitleParts.join(' · ')),
       trailing: IconButton(
@@ -355,19 +354,6 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
       onTap: () => _open(item),
     );
   }
-
-  static IconData _iconFor(TimetableElementType type) {
-    switch (type) {
-      case TimetableElementType.student:
-        return Icons.person_outline;
-      case TimetableElementType.teacher:
-        return Icons.school_outlined;
-      case TimetableElementType.room:
-        return Icons.meeting_room_outlined;
-      case TimetableElementType.schoolClass:
-        return Icons.groups_outlined;
-    }
-  }
 }
 
 class _PickerItem {

lib/view/pages/foreign_timetable/element_type_icon.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+import '../../../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';
+
+extension TimetableElementTypeIcon on TimetableElementType {
+  IconData get icon => switch (this) {
+    TimetableElementType.student => Icons.person_outline,
+    TimetableElementType.teacher => Icons.school_outlined,
+    TimetableElementType.room => Icons.meeting_room_outlined,
+    TimetableElementType.schoolClass => Icons.groups_outlined,
+  };
+}

lib/view/pages/grade_averages/grade_averages_view.dart

@@ -15,14 +15,14 @@ class GradeAveragesView extends StatelessWidget {
     create: (context) => GradeAveragesBloc(),
     child: BlocBuilder<GradeAveragesBloc, GradeAveragesState>(
       builder: (context, state) {
-        var bloc = context.watch<GradeAveragesBloc>();
+        final bloc = context.read<GradeAveragesBloc>();
 
         return Scaffold(
           appBar: AppBar(
             title: const Text('Notendurchschnittsrechner'),
             actions: [
               Visibility(
-                visible: bloc.state.grades.isNotEmpty,
+                visible: state.grades.isNotEmpty,
                 child: IconButton(
                   tooltip: 'Alle zurücksetzen',
                   onPressed: () => ConfirmDialog(
@@ -59,7 +59,7 @@ class GradeAveragesView extends StatelessWidget {
                     )
                     .toList(),
                 onSelected: (isMiddleSchool) {
-                  if (bloc.state.grades.isNotEmpty) {
+                  if (state.grades.isNotEmpty) {
                     ConfirmDialog(
                       title: 'Notensystem wechseln',
                       content:

lib/view/pages/holidays/holidays_view.dart

@@ -78,7 +78,7 @@ class HolidaysView extends StatelessWidget {
           },
           child: (state, loading) {
             final holidays = bloc.getHolidays();
-            if (holidays == null || holidays.isEmpty) {
+            if (holidays.isEmpty) {
               return const PlaceholderView(
                 icon: Icons.beach_access_outlined,
                 text: 'Keine Schulferien verfügbar',

lib/view/pages/marianum_dates/marianum_dates_view.dart

@@ -71,20 +71,16 @@ class MarianumDatesView extends StatelessWidget {
           IconButton(
             tooltip: 'Suchen',
             icon: const Icon(Icons.search),
-            onPressed: () {
+            onPressed: () => showSearch(
-              final events = bloc.getEvents() ?? const <MarianumDate>[];
-              showSearch(
               context: context,
-                delegate: SearchMarianumDates(events),
+              delegate: SearchMarianumDates(bloc.getEvents()),
-              );
+            ),
-            },
           ),
         ],
       ),
       body: LoadableStateConsumer<MarianumDatesBloc, MarianumDatesState>(
         child: (state, loading) {
-          final events = bloc.getEvents() ?? const <MarianumDate>[];
+          final groups = _groupByMonth(bloc.getEvents());
-          final groups = _groupByMonth(events);
 
           if (groups.isEmpty) {
             return const PlaceholderView(

lib/view/pages/overhang.dart

@@ -17,6 +17,8 @@ class Overhang extends StatefulWidget {
 }
 
 class _OverhangState extends State<Overhang> {
+  late final Future<bool> _reviewAvailable = InAppReview.instance.isAvailable();
+
   @override
   Widget build(BuildContext context) => Scaffold(
     appBar: AppBar(
@@ -48,7 +50,7 @@ class _OverhangState extends State<Overhang> {
         onTap: () => AppRoutes.openQrShare(context),
       ),
       FutureBuilder(
-        future: InAppReview.instance.isAvailable(),
+        future: _reviewAvailable,
         builder: (context, snapshot) {
           String? getPlatformStoreName() {
             if (Platform.isAndroid) return 'Play store';
@@ -83,7 +85,7 @@ class _OverhangState extends State<Overhang> {
               (data) => Text('Im $data'),
             ),
             trailing: const Icon(Icons.arrow_right),
-            onTap: !ready ? null : rate
+            onTap: !ready ? null : rate,
           );
         },
       ),

lib/view/pages/settings/chat_background_settings_page.dart

@@ -9,6 +9,7 @@ import '../../../storage/chat_background_settings.dart';
 import '../../../storage/settings.dart' as model;
 import '../../../utils/app_paths.dart';
 import '../../../utils/haptics.dart';
+import '../../../utils/json_equality.dart';
 import '../../../widget/async_action_button.dart';
 import '../../../widget/chat_background.dart';
 import '../../../widget/chat_background_picker_sheet.dart';
@@ -43,9 +44,10 @@ class ChatBackgroundSettingsPage extends StatelessWidget {
         builder: (context, _) {
           final settings = context.read<SettingsCubit>();
           final s = settings.val().chatBackgroundSettings;
-          final isModified =
+          final isModified = !sameJson(
-              s.toJson().toString() !=
+            s,
-              DefaultSettings.get().chatBackgroundSettings.toJson().toString();
+            DefaultSettings.get().chatBackgroundSettings,
+          );
           final showImageControls =
               s.type == ChatBackgroundType.pattern ||
               s.type == ChatBackgroundType.image;

lib/view/pages/settings/modules_settings_page.dart

@@ -5,6 +5,7 @@ import '../../../state/app/modules/app_modules.dart';
 import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../storage/settings.dart' as model;
 import '../../../utils/haptics.dart';
+import '../../../utils/json_equality.dart';
 import '../../../widget/confirm_dialog.dart';
 import 'data/default_settings.dart';
 
@@ -147,9 +148,10 @@ class ModulesSettingsPage extends StatelessWidget {
       BlocBuilder<SettingsCubit, model.Settings>(
         builder: (context, _) {
           final settings = context.read<SettingsCubit>();
-          final isModified =
+          final isModified = !sameJson(
-              settings.val().modulesSettings.toJson().toString() !=
+            settings.val().modulesSettings,
-              DefaultSettings.get().modulesSettings.toJson().toString();
+            DefaultSettings.get().modulesSettings,
+          );
           return Scaffold(
             appBar: AppBar(
               title: const Text('Module'),

lib/view/pages/settings/sections/about_section.dart

@@ -50,10 +50,7 @@ class AboutSection extends StatelessWidget {
                 _toggleDeveloperMode(context, settings, state),
           ),
         ),
-        Visibility(
+        if (settings.val().devToolsEnabled) DevToolsSection(settings: settings),
-          visible: settings.val().devToolsEnabled,
-          child: DevToolsSection(settings: settings),
-        ),
       ],
     );
   }
@@ -104,7 +101,9 @@ class AboutSection extends StatelessWidget {
           Icon(Icons.send_time_extension_outlined),
         ),
         title: const Text('Infos zu mhsl'),
-        subtitle: const Text('Für Push, Kalendertermine, Marianum Message und mehr'),
+        subtitle: const Text(
+          'Für Push, Kalendertermine, Marianum Message und mehr',
+        ),
         trailing: const Icon(Icons.arrow_right),
         onTap: () => PrivacyInfo(
           providerText: 'mhsl',

lib/view/pages/settings/sections/account_section.dart

@@ -22,21 +22,14 @@ import '../../../../widget/user_avatar.dart';
 String? _cachedDisplayName;
 String? _cachedDisplayNameFor;
 
-class AccountSection extends StatelessWidget {
+class AccountSection extends StatefulWidget {
   const AccountSection({super.key});
 
   @override
-  Widget build(BuildContext context) => const _SchoolAccount();
+  State<AccountSection> createState() => _AccountSectionState();
 }
 
-class _SchoolAccount extends StatefulWidget {
+class _AccountSectionState extends State<AccountSection> {
-  const _SchoolAccount();
-
-  @override
-  State<_SchoolAccount> createState() => _SchoolAccountState();
-}
-
-class _SchoolAccountState extends State<_SchoolAccount> {
   int _avatarVersion = 0;
   bool _avatarBusy = false;
   String? _displayName;

lib/view/pages/settings/sections/appearance_section.dart

@@ -41,25 +41,15 @@ class AppearanceSection extends StatelessWidget {
     );
   }
 
-  IconData _hapticIcon(HapticLevel level) {
+  IconData _hapticIcon(HapticLevel level) => switch (level) {
-    switch (level) {
+    HapticLevel.off => Icons.notifications_off_outlined,
-      case HapticLevel.off:
+    HapticLevel.reduced => Icons.notifications_paused_outlined,
-        return Icons.notifications_off_outlined;
+    HapticLevel.full => Icons.notifications_active_outlined,
-      case HapticLevel.reduced:
+  };
-        return Icons.notifications_paused_outlined;
-      case HapticLevel.full:
-        return Icons.notifications_active_outlined;
-    }
-  }
 
-  String _hapticLabel(HapticLevel level) {
+  String _hapticLabel(HapticLevel level) => switch (level) {
-    switch (level) {
+    HapticLevel.off => 'Aus',
-      case HapticLevel.off:
+    HapticLevel.reduced => 'Reduziert',
-        return 'Aus';
+    HapticLevel.full => 'Vollständig',
-      case HapticLevel.reduced:
+  };
-        return 'Reduziert';
-      case HapticLevel.full:
-        return 'Vollständig';
-    }
-  }
 }

lib/view/pages/settings/sections/dev_tools_section.dart

@@ -26,15 +26,10 @@ import '../widgets/endpoint_picker.dart';
 import '../widgets/settings_checkbox_tile.dart';
 import '../widgets/settings_dropdown_tile.dart';
 
-class DevToolsSection extends StatefulWidget {
+class DevToolsSection extends StatelessWidget {
   final SettingsCubit settings;
   const DevToolsSection({required this.settings, super.key});
 
-  @override
-  State<DevToolsSection> createState() => _DevToolsSectionState();
-}
-
-class _DevToolsSectionState extends State<DevToolsSection> {
   @override
   Widget build(BuildContext context) => Column(
     children: [
@@ -54,11 +49,11 @@ class _DevToolsSectionState extends State<DevToolsSection> {
             context,
             children: (sheetCtx) => [
               BlocBuilder<SettingsCubit, model.Settings>(
-                bloc: widget.settings,
+                bloc: settings,
                 builder: (_, _) {
-                  final dev = widget.settings.val().devToolsSettings;
+                  final dev = settings.val().devToolsSettings;
                   DevToolsSettings write() =>
-                      widget.settings.val(write: true).devToolsSettings;
+                      settings.val(write: true).devToolsSettings;
                   return Column(
                     mainAxisSize: MainAxisSize.min,
                     children: [
@@ -122,17 +117,17 @@ class _DevToolsSectionState extends State<DevToolsSection> {
         title: const Text('Marianum-Connect-Server'),
         subtitle: Text(
           MarianumConnectEndpointPicker.labelFor(
-            widget.settings.val().devToolsSettings,
+            settings.val().devToolsSettings,
           ),
         ),
         trailing: const Icon(Icons.arrow_right),
         onTap: () =>
-            MarianumConnectEndpointPicker.show(context, widget.settings),
+            MarianumConnectEndpointPicker.show(context, settings),
       ),
       BlocBuilder<SettingsCubit, model.Settings>(
-        bloc: widget.settings,
+        bloc: settings,
         builder: (_, _) {
-          final override = widget.settings
+          final override = settings
               .val()
               .devToolsSettings
               .emergencyNoticeUrl
@@ -143,7 +138,7 @@ class _DevToolsSectionState extends State<DevToolsSection> {
             subtitle: Text(override.isEmpty ? 'Standardquelle' : override),
             trailing: const Icon(Icons.arrow_right),
             onTap: () =>
-                _EmergencyNoticeUrlEditor.show(context, widget.settings),
+                _EmergencyNoticeUrlEditor.show(context, settings),
           );
         },
       ),
@@ -152,18 +147,18 @@ class _DevToolsSectionState extends State<DevToolsSection> {
         icon: Icons.settings_applications_outlined,
         title: 'Einstellungen',
         describe: () async => filesize(
-          utf8.encode(jsonEncode(widget.settings.val().toJson())).length,
+          utf8.encode(jsonEncode(settings.val().toJson())).length,
         ),
         onOpen: (_) async => AppRoutes.openJsonViewer(
           context,
-          widget.settings.val().toJson(),
+          settings.val().toJson(),
           title: 'Einstellungen',
         ),
         clearTitle: 'Einstellungen zurücksetzen',
         clearContent:
             'Alle Einstellungen gehen verloren! Accountdaten sowie App-Daten '
             'sind nicht betroffen.',
-        onClear: widget.settings.reset,
+        onClear: settings.reset,
       ),
       _StorageTile(
         icon: Icons.account_tree_outlined,

lib/view/pages/settings/widgets/privacy_info.dart

@@ -5,11 +5,11 @@ import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/details_bottom_sheet.dart';
 
 class PrivacyInfo {
-  String providerText;
+  final String providerText;
-  String privacyUrl;
+  final String privacyUrl;
-  String imprintUrl;
+  final String imprintUrl;
 
-  PrivacyInfo({
+  const PrivacyInfo({
     required this.providerText,
     required this.imprintUrl,
     required this.privacyUrl,

lib/view/pages/settings/widgets/push_status_sheet.dart

@@ -228,11 +228,7 @@ class _PushStatusBodyState extends State<_PushStatusBody>
   /// otherwise re-registering IS the primary next step and the test action is
   /// omitted (it could not succeed and the checklist explains why).
   Widget _actions(PushStatusReport report) {
-    const spinner = SizedBox(
+    const spinner = AppProgressIndicator.small();
-      width: 16,
-      height: 16,
-      child: CircularProgressIndicator(strokeWidth: 2),
-    );
     final ready = report.readyForTestNotification;
     return Row(
       crossAxisAlignment: CrossAxisAlignment.start,

lib/view/pages/share_intent/share_chat_picker.dart

@@ -67,7 +67,12 @@ class ShareChatPicker extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final talkSettings = context.watch<SettingsCubit>().val().talkSettings;
+    final (favoritesToTop, unreadToTop) = context.select(
+      (SettingsCubit c) => (
+        c.state.talkSettings.sortFavoritesToTop,
+        c.state.talkSettings.sortUnreadToTop,
+      ),
+    );
     return Scaffold(
       appBar: AppBar(
         title: const Text('Talk-Chat auswählen'),
@@ -100,8 +105,8 @@ class ShareChatPicker extends StatelessWidget {
           if (rooms == null) return const SizedBox.shrink();
           final sorted = rooms
               .sortBy(
-                favoritesToTop: talkSettings.sortFavoritesToTop,
+                favoritesToTop: favoritesToTop,
-                unreadToTop: talkSettings.sortUnreadToTop,
+                unreadToTop: unreadToTop,
               )
               // Hide chats the user can't write to (announcement channels,
               // archived rooms, …) — uploading there would only fail at the
@@ -195,8 +200,8 @@ Future<void> _runShareFlow(
   try {
     await action();
   } catch (e) {
-    if (context.mounted) Navigator.of(context).pop();
     if (context.mounted) {
+      Navigator.of(context).pop();
       InfoDialog.show(
         context,
         errorToUserMessage(e),

lib/view/pages/share_intent/share_folder_picker.dart

@@ -13,11 +13,10 @@ import '../../../state/app/infrastructure/loadable_state/view/loadable_state_con
 import '../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../state/app/modules/files/bloc/files_bloc.dart';
 import '../../../state/app/modules/files/bloc/files_state.dart';
-import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../widget/centered_leading.dart';
 import '../../../widget/info_dialog.dart';
 import '../../../widget/placeholder_view.dart';
-import '../files/data/sort_options.dart';
+import '../files/data/file_sort.dart';
 import '../files/files_upload_dialog.dart';
 import '../files/widgets/add_file_menu.dart';
 import '../files/widgets/file_leading.dart';
@@ -73,22 +72,6 @@ class _ShareFolderPickerView extends StatefulWidget {
 }
 
 class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
-  late final SettingsCubit _settings;
-  late SortOption _currentSort;
-  late bool _ascending;
-
-  @override
-  void initState() {
-    super.initState();
-    _settings = context.read<SettingsCubit>();
-    _currentSort = _settings.val().fileSettings.sortBy;
-    _ascending = _settings.val().fileSettings.ascending;
-  }
-
-  void _enter(FilesBloc bloc, List<String> currentPath, String folderName) {
-    bloc.setPath([...currentPath, folderName]);
-  }
-
   void _goUp(FilesBloc bloc, List<String> currentPath) {
     if (currentPath.isEmpty) return;
     bloc.setPath(currentPath.sublist(0, currentPath.length - 1));
@@ -97,6 +80,9 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
   @override
   Widget build(BuildContext context) {
     final bloc = context.read<FilesBloc>();
+    // Selected here, not in the LoadableStateConsumer child: that closure runs
+    // during the consumer's build, where this context may not subscribe.
+    final sort = context.select(fileSortOf);
     return BlocBuilder<FilesBloc, LoadableState<FilesState>>(
       buildWhen: (a, b) => a.data?.currentPath != b.data?.currentPath,
       builder: (_, outerState) {
@@ -109,9 +95,9 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
           canPop: currentPath.isEmpty,
           onPopInvokedWithResult: (didPop, _) {
             if (didPop) return;
-            if (currentPath.isNotEmpty) _goUp(bloc, currentPath);
+            _goUp(bloc, currentPath);
           },
-          child: _buildScaffold(context, bloc, currentPath),
+          child: _buildScaffold(context, bloc, currentPath, sort),
         );
       },
     );
@@ -121,6 +107,7 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
     BuildContext context,
     FilesBloc bloc,
     List<String> currentPath,
+    FileSort sort,
   ) => Scaffold(
     appBar: AppBar(
       title: Text(
@@ -133,22 +120,7 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
           tooltip: 'Ordner erstellen',
           onPressed: () => showCreateFolderDialog(context, bloc),
         ),
-        FilesSortActions(
+        const FilesSortActions(),
-          currentSort: _currentSort,
-          ascending: _ascending,
-          onDirectionChanged: (e) {
-            setState(() {
-              _ascending = e;
-              _settings.val(write: true).fileSettings.ascending = e;
-            });
-          },
-          onSortChanged: (e) {
-            setState(() {
-              _currentSort = e;
-              _settings.val(write: true).fileSettings.sortBy = e;
-            });
-          },
-        ),
       ],
     ),
     floatingActionButton: FloatingActionButton.extended(
@@ -160,12 +132,7 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
     body: LoadableStateConsumer<FilesBloc, FilesState>(
       isReady: (state) => state.listing != null,
       child: (state, _) {
-        final listing = state.listing!;
+        final entries = state.listing!.sortedBy(sort);
-        final entries = listing.sortBy(
-          sortOption: _currentSort,
-          foldersToTop: _settings.val().fileSettings.sortFoldersToTop,
-          reversed: _ascending,
-        );
 
         if (entries.isEmpty) {
           return PlaceholderView(
@@ -181,18 +148,16 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
           itemCount: entries.length,
           itemBuilder: (context, i) {
             final entry = entries[i];
-            if (entry.isDirectory) {
             return ListTile(
+              enabled: entry.isDirectory,
               leading: CenteredLeading(FileLeading(file: entry)),
               title: Text(entry.name),
-                trailing: const Icon(Icons.chevron_right),
+              trailing: entry.isDirectory
-                onTap: () => _enter(bloc, state.currentPath, entry.name),
+                  ? const Icon(Icons.chevron_right)
-              );
+                  : null,
-            }
+              onTap: entry.isDirectory
-            return ListTile(
+                  ? () => bloc.setPath([...state.currentPath, entry.name])
-              enabled: false,
+                  : null,
-              leading: CenteredLeading(FileLeading(file: entry)),
-              title: Text(entry.name),
             );
           },
         );

lib/view/pages/talk/chat_view.dart

@@ -61,15 +61,15 @@ class _ChatViewState extends State<ChatView> with RouteAware {
 
   // Captured in initState because the framework has unmounted us by the
   // time dispose runs.
-  ChatBloc? _chatBlocRef;
+  late final ChatBloc _chatBloc;
-  ChatListBloc? _chatListBlocRef;
+  late final ChatListBloc _chatListBloc;
   PageRoute<dynamic>? _subscribedRoute;
 
   @override
   void initState() {
     super.initState();
-    _chatBlocRef = context.read<ChatBloc>();
+    _chatBloc = context.read<ChatBloc>();
-    _chatListBlocRef = context.read<ChatListBloc>();
+    _chatListBloc = context.read<ChatListBloc>();
     _positionsListener.itemPositions.addListener(_onScrollPositions);
     NotificationTasks.clearNotificationsForChat(widget.room.token);
   }
@@ -83,9 +83,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     // before the user reaches the top — the load stays invisible.
     final maxIndex = positions.map((p) => p.index).reduce(math.max);
     if (maxIndex < _itemCount - _kLoadOlderPrefetchRows) return;
-    final data = _chatBlocRef?.state.data;
+    _chatBloc.loadOlder();
-    if (data == null || !data.hasMoreOld || data.isLoadingOlder) return;
-    _chatBlocRef?.loadOlder();
   }
 
   @override
@@ -107,7 +105,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     // A stacked chat above us was just popped (typical: notification tap
     // opened another chat). The global ChatBloc currently points at that
     // other chat's token, so our isReady predicate fails until we re-claim.
-    _chatBlocRef?.setToken(widget.room.token);
+    _chatBloc.setToken(widget.room.token);
   }
 
   @override
@@ -117,7 +115,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     }
     _positionsListener.itemPositions.removeListener(_onScrollPositions);
     _markAsReadFinal();
-    _chatBlocRef?.leaveChat(widget.room.token);
+    _chatBloc.leaveChat(widget.room.token);
     _searchTextController.dispose();
     Debouncer.cancel(_searchDebounceTag);
     super.dispose();
@@ -129,15 +127,15 @@ class _ChatViewState extends State<ChatView> with RouteAware {
   /// belongs to a different room, and writing its max-id as our marker
   /// would regress our server cursor.
   void _markAsReadFinal() {
-    final state = _chatBlocRef?.state.data;
+    final state = _chatBloc.state.data;
     if (state == null) return;
     if (state.currentToken != widget.room.token) return;
     final response = state.chatResponse;
     if (response == null) return;
     final maxId = response.data.map((m) => m.id).fold<int>(0, math.max);
     if (maxId == 0) return;
-    _chatListBlocRef?.markRoomAsRead(widget.room.token, maxId);
+    _chatListBloc.markRoomAsRead(widget.room.token, maxId);
-    unawaited(_chatBlocRef!.sendServerReadMarker(widget.room.token, maxId));
+    unawaited(_chatBloc.sendServerReadMarker(widget.room.token, maxId));
   }
 
   @override
@@ -148,31 +146,34 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     }
   }
 
-  void _refresh() {
+  void _refetch() => _chatBloc.setToken(widget.room.token);
-    context.read<ChatBloc>().setToken(widget.room.token);
-  }
-
-  void _refetch({bool renew = false}) => _refresh();
 
   // The built rows only depend on the chat data and the search state; the list
   // itself rebuilds far more often (loading flips, keyboard, parent rebuilds),
   // and re-sorting plus re-creating every bubble each time is wasted work.
+  // The top marker is cached separately so a loading-older flip doesn't
+  // rebuild every message row.
+  Object? _messagesKey;
+  List<Widget> _messages = const [];
   Object? _itemsKey;
   List<Widget> _items = const [];
 
   List<Widget> _itemsFor(ChatState state) {
-    final key = (
+    final messagesKey = (
       state.chatResponse,
-      state.isLoadingOlder,
-      state.hasMoreOld,
       _searchActive,
       _searchQuery,
       _activeMatchIndex,
       widget.room,
     );
+    if (messagesKey != _messagesKey) {
+      _messagesKey = messagesKey;
+      _messages = _buildMessages(state.chatResponse!).reversed.toList();
+    }
+    final key = (_messages, state.isLoadingOlder, state.hasMoreOld);
     if (key == _itemsKey) return _items;
     _itemsKey = key;
-    final items = _buildMessages(state.chatResponse!).reversed.toList();
+    final items = [..._messages];
     // reverse:true renders index 0 at the bottom, so the top marker
     // (spinner / start-of-chat) goes at the end.
     if (state.isLoadingOlder) {
@@ -191,26 +192,20 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     return _items = items;
   }
 
-  void _enterSearchMode() {
+  void _enterSearchMode() => _resetSearch(active: true);
-    setState(() {
-      _searchActive = true;
-      _searchQuery = '';
-      _matches = const [];
-      _activeMatchIndex = 0;
-      _matchesComputedFor = null;
-      _matchesComputedQuery = null;
-      _searchTextController.clear();
-    });
-  }
 
   void _exitSearchMode() {
     Debouncer.cancel(_searchDebounceTag);
+    _matchIndices.clear();
+    _resetSearch(active: false);
+  }
+
+  void _resetSearch({required bool active}) {
     setState(() {
-      _searchActive = false;
+      _searchActive = active;
       _searchQuery = '';
       _matches = const [];
       _activeMatchIndex = 0;
-      _matchIndices.clear();
       _matchesComputedFor = null;
       _matchesComputedQuery = null;
       _searchTextController.clear();
@@ -233,7 +228,7 @@ class _ChatViewState extends State<ChatView> with RouteAware {
   }
 
   void _applySearch(String q) {
-    final chatResponse = context.read<ChatBloc>().state.data?.chatResponse;
+    final chatResponse = _chatBloc.state.data?.chatResponse;
     setState(() {
       _searchQuery = q;
       _activeMatchIndex = 0;
@@ -260,19 +255,12 @@ class _ChatViewState extends State<ChatView> with RouteAware {
     _matchesComputedQuery = _searchQuery;
   }
 
-  void _goToPreviousMatch() {
+  // Matches are newest-first, so "previous" (older) steps forward.
-    if (_matches.isEmpty) return;
+  void _stepMatch(int delta) {
-    setState(() {
-      _activeMatchIndex = (_activeMatchIndex + 1) % _matches.length;
-    });
-    WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToActiveMatch());
-  }
-
-  void _goToNextMatch() {
     if (_matches.isEmpty) return;
     setState(() {
       _activeMatchIndex =
-          (_activeMatchIndex - 1 + _matches.length) % _matches.length;
+          (_activeMatchIndex + delta + _matches.length) % _matches.length;
     });
     WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToActiveMatch());
   }
@@ -379,6 +367,11 @@ class _ChatViewState extends State<ChatView> with RouteAware {
 
   @override
   Widget build(BuildContext context) {
+    final input = ChatTextfield(
+      widget.room.token,
+      selfId: widget.selfId,
+      roomType: widget.room.type,
+    );
     return _KeyboardDismissPopScope(
       child: Scaffold(
         backgroundColor: const Color(0xffefeae2),
@@ -389,8 +382,8 @@ class _ChatViewState extends State<ChatView> with RouteAware {
                 activeIndex: _matches.isEmpty ? -1 : _activeMatchIndex,
                 onChanged: _onSearchChanged,
                 onClose: _exitSearchMode,
-                onPrevious: _matches.isEmpty ? null : _goToPreviousMatch,
+                onPrevious: _matches.isEmpty ? null : () => _stepMatch(1),
-                onNext: _matches.isEmpty ? null : _goToNextMatch,
+                onNext: _matches.isEmpty ? null : () => _stepMatch(-1),
               )
             : ClickableAppBar(
                 onTap: () =>
@@ -443,18 +436,8 @@ class _ChatViewState extends State<ChatView> with RouteAware {
               ColoredBox(
                 color: Theme.of(context).colorScheme.surface,
                 child: TalkNavigator.isSecondaryVisible(context)
-                    ? ChatTextfield(
+                    ? input
-                        widget.room.token,
+                    : SafeArea(child: input),
-                        selfId: widget.selfId,
-                        roomType: widget.room.type,
-                      )
-                    : SafeArea(
-                        child: ChatTextfield(
-                          widget.room.token,
-                          selfId: widget.selfId,
-                          roomType: widget.room.type,
-                        ),
-                      ),
               ),
             ],
           ),